Definition: Impossible to satisfy; having an unappeasable or unquenchable appetite or desire for something

Sample sentence: Her insatiable thirst for knowledge led her to read hundreds of books each year.

Definition: Impossible to stop or prevent; inevitable or unalterable

Sample sentence: The inexorable march of time continues regardless of our actions or desires.

Definition: Impossible to stop or prevent; relentless or unyielding; not able to be persuaded or moved

Sample sentence: The march of time is inexorable and cannot be halted or slowed down.

Definition: Impressive or grand in appearance or size; awe-inspiring

Sample sentence: The imposing mountain stood tall, dominating the landscape and challenging all who dared to climb it.

Definition: In the initial stage; beginning to happen or develop; at an early stage of development

Sample sentence: The incipient technology was not yet ready for mass production, but showed great potential.

Definition: Incapable of making errors or mistakes; never failing or always accurate; certain or absolutely reliable

Sample sentence: The scientist was respected but understood that nobody is infallible, even the most brilliant minds.

Definition: Inclined to lay down principles as incontrovertibly true; asserting opinions in an authoritative or arrogant manner

Sample sentence: The politician's dogmatic approach alienated many potential supporters who questioned his inflexibility.

Definition: Inclined to shed tears easily; tending to cause or express sadness or sorrow

Sample sentence: The movie's lachrymose scenes had the entire audience reaching for tissues.

Definition: Independent, self-governing, or self-directing; not subject to external control or influence; capable of functioning on its own

Sample sentence: The workers formed an autonomous collective, making decisions and managing resources without the need for a traditional management structure.

Definition: Indirect or not straightforward; slanting or inclined, especially in a diagonal direction

Sample sentence: The politician's oblique criticism of his rival left many wondering if he was subtly launching a personal attack.

Definition: Innocent and unsuspecting; naïve; simple and straightforward; sincere

Sample sentence: The ingenuous child believed the magician had actually made the coin disappear.

Definition: Innocent and without deceit; sincere and straightforward

Sample sentence: The child's guileless stare made it clear that she hadn't taken the missing cookies.

Definition: Innocent, trusting, and sincere; straightforward or honest; displaying childlike simplicity and openness

Sample sentence: The ingenuous child was quick to believe the fantastical stories his older siblings spun.

Definition: Insisting on immediate attention or obedience, especially in a brusque or imperious manner; allowing for no contradiction or debate

Sample sentence: The boss's peremptory demands left no room for questions or discussion.

Definition: Insisting on immediate attention or obedience, often in a brusque or imperious manner; authoritarian or commanding

Sample sentence: The peremptory tone of his voice made it clear that he wasn't used to being questioned.

Definition: Intended to teach or educate, often with a moral or intellectual lesson; overly instructive or preachy

Sample sentence: The novel's didactic tone made it difficult for some readers to enjoy the story without feeling lectured.

Definition: Intense anger or wrath; fury

Sample sentence: The politician's controversial remarks sparked the ire of the public.

Definition: Intensely passionate or emotional; heated or vehement

Sample sentence: The political rally was marked by fervid speeches and impassioned debates.

Definition: Intensely passionate or enthusiastic; burning or glowing hot

Sample sentence: The fervid speeches roused the crowd, inspiring them to support the cause.

Definition: Involving a burdensome amount of effort or difficulty; oppressive or troublesome

Sample sentence: The onerous task of cleaning out the old garage took the entire weekend to complete.

Definition: Involving a close, mutually beneficial relationship or cooperation between two different organisms or entities

Sample sentence: The symbiotic relationship between bees and flowers benefits both, as the bees obtain nectar for food while aiding in the flowers' pollination.

Definition: Involving irony, which is an expression or situation that means the opposite of what is expected or intended; often implying humor or sarcasm

Sample sentence: It was ironic that he won the lottery just after declaring bankruptcy.

Definition: Involving strong critical or controversial writing or speech; argumentative or disputatious

Sample sentence: The polemical article stirred up heated debates among readers, taking strong positions on a divisive issue.

Definition: Irritable and likely to cause trouble or disagreement; quarrelsome or unruly

Sample sentence: The long day and lack of sleep left the children feeling fractious and hard to manage.

Definition: Irritable, bad-tempered, or difficult to manage or control; inclined to cause trouble or discord

Sample sentence: The fractious toddler threw a tantrum when she didn't get her way, testing the patience of her parents.

Definition: Just beginning to form or develop; not fully formed or completed; in an initial or rudimentary stage

Sample sentence: Her inchoate ideas for her novel slowly evolved into a complex, well-structured plot.

Definition: Keen insight or perception; the ability to understand or see through complex situations or problems

Sample sentence: Her perspicacity allowed her to quickly grasp the intricate details of the business proposal.

Definition: Keen, incisive, or vigorous in thought or expression, often with a sharp or biting tone; penetrating or clear-cut

Sample sentence: Her trenchant wit and insightful observations quickly won over the audience during her stand-up comedy routine.

Definition: Keenness and accuracy of insight, judgment, or perception; quick intelligence, especially in a specific area or field

Sample sentence: His financial acumen helped him grow his small business into a thriving corporation.

Definition: Known or understood by only a few; mysterious or secret

Sample sentence: The scholars spent years trying to decipher the arcane text, hoping it would reveal hidden knowledge.

Definition: Known or understood by only a few; mysterious, secret, or obscure; esoteric or specialized in knowledge

Sample sentence: The mechanics of quantum physics remain arcane to all but a select group of scientists and mathematicians.

Definition: Lack of interest, enthusiasm, or concern; indifference

Sample sentence: Many people attribute the low voter turnout to widespread apathy among the younger generation.

Definition: Lacking a clear, definite, or distinct shape, form, or structure; vague or unclassifiable

Sample sentence: The amorphous blob of clay would soon be transformed into a beautiful sculpture under the artist's skilled hands.

Definition: Lacking a plan, purpose, or enthusiasm; characterized by random or disconnected thoughts or actions

Sample sentence: The students engaged in a desultory conversation about their summer plans, with no one really focused on the topic.

Definition: Lacking care or attention to duty; negligent or careless

Sample sentence: The lifeguard was remiss in his duties, leading to a dangerous situation for swimmers on the beach.

Definition: Lacking distinctive or interesting qualities; not easily classified or described

Sample sentence: The suspect was described as a nondescript man in his 30s wearing a plain jacket and jeans.

Definition: Lacking energy, spirit, or force; slow, relaxed, or sluggish in movement or expression

Sample sentence: In the sweltering heat, the people moved about with languid movements, trying to conserve their energy.

Definition: Lacking flavor, taste or interest; dull, uninteresting, or boring

Sample sentence: The insipid meal left everyone craving something more flavorful and exciting.

Definition: Lacking flavor, zest, or interest; dull; tasteless; unexciting

Sample sentence: The food at the wedding reception was bland and insipid, leaving the guests unsatisfied.

Definition: Lacking intelligence or sense; foolish or inane

Sample sentence: His fatuous comments during the meeting only served to undermine his coworkers' respect for him.

Definition: Lacking interest or significance; dull or boring; immature, childish or simplistic

Sample sentence: The presentation was filled with jejune information that everyone already knew.

Definition: Lacking money or resources; impoverished or needy

Sample sentence: Due to her indigent circumstances, she relied on the generosity of others for her basic needs.

Definition: Lacking originality, freshness, or novelty; trite, commonplace, or dull; predictable or clichéd

Sample sentence: Critics dismissed the film as just another banal romantic comedy with no new ideas or surprises.

Definition: Lacking self-confidence or assurance; shy or modest in behavior, often due to self-doubt

Sample sentence: His diffident manner led others to underestimate his abilities, but they were often surprised by his talent.

Definition: Lacking sharpness or quickness of mind; slow to understand or perceive something; not clear or precise in thought or expression

Sample sentence: The obtuse student struggled to grasp the complexities of the mathematical concept.

Definition: Lacking skill, competence, or ability to perform effectively; unsuitable or inappropriate; clumsy or incompetent

Sample sentence: His inept attempt at fixing the sink only made the leak worse.

Definition: Lacking social grace, tact, or sophistication; awkward, clumsy, or insensitive in behavior or manner

Sample sentence: His gauche attempts at humor often left people feeling uncomfortable and unsure of how to respond.

Definition: Lacking sufficient space, room, or capacity to accommodate; uncomfortable or cramped; inconvenient

Sample sentence: The incommodious hotel room made it difficult for the guests to be comfortable during their stay.

Definition: Lacking the ability or strength to move; not active or able to produce a desired effect; chemically inactive

Sample sentence: After a long day of manual labor, his exhausted body felt completely inert.

Definition: Lasting for a very short time; brief or momentary

Sample sentence: The beautiful sunset was a fleeting moment, soon replaced by the darkness of night.