| concerted | (adjective) involving the joint activity of two or more | Synonyms: conjunct, conjunctive, cooperative, united |
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| confederate | (adjective) united in a confederacy or league | Synonyms: allied, confederative |
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| confederative | (adjective) united in a confederacy or league | Synonyms: allied, confederate |
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| congeneric | (adjective) belonging to the same genus | Synonyms: congenerical, congenerous |
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| congenerical | (adjective) belonging to the same genus | Synonyms: congeneric, congenerous |
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| congenerous | (adjective) belonging to the same genus | Synonyms: congeneric, congenerical |
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| conglomerate | (adjective) composed of heterogeneous elements gathered into a mass | - |
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| coniferous | (adjective) of or relating to or part of trees or shrubs bearing cones and evergreen leaves | Synonyms: cone-bearing |
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| conquerable | (adjective) subject to being conquered or overcome | - |
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| (adjective) capable of being surmounted or excelled | Synonyms: superable |
| conservative | (adjective) resistant to change, particularly in relation to politics or religion | - |
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| (adjective) unimaginatively conventional | Synonyms: button-down, buttoned-down |
| (adjective) conforming to the standards and conventions of the middle class | Synonyms: bourgeois, materialistic |
| (adjective) avoiding excess | Synonyms: cautious |
| (adjective) having social or political views favoring conservatism | - |
| conserved | (adjective) protected from harm or loss | - |
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| considerable | (adjective) large or relatively large in number or amount or extent or degree | - |
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| considerate | (adjective) showing concern for the rights and feelings of others | - |
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| considered | (adjective) carefully weighed | - |
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| conterminous | (adjective) being of equal extent or scope or duration | Synonyms: coextensive, coterminous |
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| (adjective) connecting without a break; within a common boundary | Synonyms: contiguous |
| (adjective) having a common boundary or edge; abutting; touching | Synonyms: adjacent, contiguous, neighboring, neighbouring |
| contralateral | (adjective) on or relating to the opposite side (of the body) | - |
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| controversial | (adjective) marked by or capable of arousing controversy | - |
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| convergent | (adjective) tending to come together from different directions | - |
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| conversant | (adjective) (usually followed by `with') well informed about or knowing thoroughly | Synonyms: familiar |
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| conversational | (adjective) characteristic of informal spoken language or conversation | Synonyms: colloquial |
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| converse | (adjective) of words so related that one reverses the relation denoted by the other | - |
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| (adjective) turned about in order or relation | Synonyms: reversed, transposed |
| convertible | (adjective) capable of being exchanged for or replaced by something of equal value | Synonyms: exchangeable |
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| (adjective) designed to be changed from one use or form to another | - |
| (adjective) capable of being changed in substance as if by alchemy | Synonyms: transformable, translatable, transmutable |
| cooperative | (adjective) done with or working with others for a common purpose or benefit | - |
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| (adjective) involving the joint activity of two or more | Synonyms: concerted, conjunct, conjunctive, united |
| (adjective) willing to adjust to differences in order to obtain agreement | Synonyms: accommodative |
| coppery | (adjective) of something having the color of copper | Synonyms: copper colored |
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| coreferent | (adjective) related by sharing a symbolic link to a concrete object or an abstraction | - |
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| coreferential | (adjective) relating to coreference | Synonyms: co-referent |
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| cornered | (adjective) forced to turn and face attackers | Synonyms: at bay, trapped, treed |
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| corticoafferent | (adjective) of a nerve fiber or impulse originating outside and passing toward the cerebral cortex | Synonyms: corticipetal |
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| corticoefferent | (adjective) of a nerve fiber passing outward from the cerebral cortex | Synonyms: corticifugal, corticofugal |
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| cosher | (adjective) conforming to Jewish dietary laws | Synonyms: kosher |
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| coterminous | (adjective) being of equal extent or scope or duration | Synonyms: coextensive, conterminous |
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| counter | (adjective) indicating opposition or resistance | Synonyms: antagonistic |
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| counteractive | (adjective) opposing or neutralizing or mitigating an effect by contrary action | - |
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| counterbalanced | (adjective) brought into equipoise by means of a weight or force that offsets another | Synonyms: counterpoised |
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| counterclockwise | (adjective) in the direction opposite to the rotation of the hands of a clock | Synonyms: anticlockwise, contraclockwise |
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| counterfactual | (adjective) going counter to the facts (usually as a hypothesis) | Synonyms: contrary to fact |
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| counterfeit | (adjective) not genuine; imitating something superior | Synonyms: imitative |
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| counterinsurgent | (adjective) of or relating or characteristic of actions taken by a government to defeat insurgency | - |
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| counterintuitive | (adjective) contrary to what common sense would suggest | - |
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| counterpoised | (adjective) brought into equipoise by means of a weight or force that offsets another | Synonyms: counterbalanced |
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| counterproductive | (adjective) tending to hinder the achievement of a goal | - |
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| counterrevolutionary | (adjective) marked by opposition or antipathy to revolution | - |
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| (adjective) relating to or being a counterrevolution | - |
| countertenor | (adjective) of or being the highest male voice; having a range above that of tenor | Synonyms: alto |
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| counterterror | (adjective) intended to prevent terrorism | Synonyms: counterterrorist |
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| counterterrorist | (adjective) intended to prevent terrorism | Synonyms: counterterror |
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| covered | (adjective) overlaid or spread or topped with or enclosed within something; sometimes used as a combining form | - |
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| covert | (adjective) secret or hidden; not openly practiced or engaged in or shown or avowed | - |
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| (adjective) (of a wife) being under the protection of her husband | - |
| crackers | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| criterial | (adjective) serving as a basis for evaluation | Synonyms: criterional |
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| criterional | (adjective) serving as a basis for evaluation | Synonyms: criterial |
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| cruciferous | (adjective) of or relating to or belonging to the plant family Cruciferae | - |
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| cumbersome | (adjective) not elegant or graceful in expression | Synonyms: awkward, clumsy, ill-chosen, inapt, inept |
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| (adjective) difficult to handle or use especially because of size or weight | Synonyms: cumbrous |
| cyanobacterial | (adjective) relating to or caused by photosynthetic bacteria of the class Cyanobacteria | Synonyms: cyanophyte |
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| cybernetic | (adjective) of or relating the principles of cybernetics | - |
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| dangerous | (adjective) involving or causing danger or risk; liable to hurt or harm | Synonyms: unsafe |
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| (adjective) causing fear or anxiety by threatening great harm | Synonyms: grave, grievous, life-threatening, serious, severe |
| dapper | (adjective) marked by up-to-dateness in dress and manners | Synonyms: dashing, jaunty, natty, raffish, rakish, snappy, spiffy, spruce |
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| daughterly | (adjective) befitting a daughter | - |
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| decipherable | (adjective) easily deciphered | Synonyms: clear, readable |
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| deciphered | (adjective) converted from cryptic to intelligible language | - |
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| dedifferentiated | (adjective) having experienced or undergone dedifferentiation or the loss of specialization in form or function | - |
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| deferent | (adjective) showing deference | Synonyms: deferential, regardful |
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| deferential | (adjective) showing deference | Synonyms: deferent, regardful |
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| defervescent | (adjective) of or relating to the reduction of a fever | - |
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| degenerate | (adjective) unrestrained by convention or morality | Synonyms: debauched, degraded, dissipated, dissolute, fast, libertine, profligate, riotous |
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| degenerative | (adjective) (of illness) marked by gradual deterioration of organs and cells along with loss of function | - |
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| deleterious | (adjective) harmful to living things | Synonyms: hurtful, injurious |
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| deliberate | (adjective) carefully thought out in advance | Synonyms: calculated, measured |
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| (adjective) unhurried and with care and dignity | Synonyms: careful, measured |
| (adjective) characterized by conscious design or purpose | Synonyms: intentional, knowing |
| deliberative | (adjective) involved in or characterized by deliberation and discussion and examination | - |
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| deliverable | (adjective) suitable for or ready for delivery | - |
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| denumerable | (adjective) that can be counted | Synonyms: countable, enumerable, numerable |
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| deranged | (adjective) driven insane | Synonyms: crazed, half-crazed |
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| derelict | (adjective) in deplorable condition | Synonyms: bedraggled, broken-down, dilapidated, ramshackle, tatterdemalion, tumble-down |
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| (adjective) failing in what duty requires | Synonyms: delinquent, neglectful, remiss |
| (adjective) forsaken by owner or inhabitants | Synonyms: abandoned, deserted |
| (adjective) worn and broken down by hard use | Synonyms: creaky, decrepit, flea-bitten, run-down, woebegone |
| derisive | (adjective) abusing vocally; expressing contempt or ridicule | Synonyms: gibelike, jeering, mocking, taunting |
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| derisory | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, idiotic, laughable, ludicrous, nonsensical, preposterous, ridiculous |
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| derivable | (adjective) capable of being derived | - |
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| derivational | (adjective) characterized by inflections indicating a semantic relation between a word and its base | - |
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| derivative | (adjective) resulting from or employing derivation | - |
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| derived | (adjective) formed or developed from something else; not original | - |
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| dermal | (adjective) of or relating to or located in the dermis | Synonyms: dermic |
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| (adjective) of or relating to a cuticle or cuticula | Synonyms: cuticular, epidermal, epidermic |
| (adjective) relating to or existing on or affecting the skin | Synonyms: cutaneal, cutaneous |
| dermatologic | (adjective) of or relating to or practicing dermatology | Synonyms: dermatological |
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| dermatological | (adjective) of or relating to or practicing dermatology | Synonyms: dermatologic |
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| dermic | (adjective) of or relating to or located in the dermis | Synonyms: dermal |
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| derogative | (adjective) expressive of low opinion | Synonyms: derogatory, disparaging |
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| derogatory | (adjective) expressive of low opinion | Synonyms: derogative, disparaging |
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| derp | (adjective) appearing silly or stupid especially in a cute manner | - |
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| deserted | (adjective) forsaken by owner or inhabitants | Synonyms: abandoned, derelict |
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| deserved | (adjective) properly deserved | Synonyms: merited |
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| deserving | (adjective) (often used ironically) worthy of being treated in a particular way | Synonyms: worth |
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| desperate | (adjective) showing extreme courage; especially of actions courageously undertaken in desperation as a last resort | Synonyms: heroic |
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| (adjective) fraught with extreme danger; nearly hopeless | Synonyms: dire |
| (adjective) arising from or marked by despair or loss of hope | Synonyms: despairing |
| (adjective) showing extreme urgency or intensity especially because of great need or desire | - |
| (adjective) desperately determined | Synonyms: do-or-die |
| (adjective) (of persons) dangerously reckless or violent as from urgency or despair | - |
| detergent | (adjective) having cleansing power | Synonyms: detersive |
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| determinable | (adjective) capable of being determined or limited or fixed | - |
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| determinant | (adjective) having the power or quality of deciding | Synonyms: deciding, determinative, determining |
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| determinate | (adjective) precisely determined or limited or defined; especially fixed by rule or by a specific and constant cause | - |
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| (adjective) not continuing to grow indefinitely at the apex | - |
| (adjective) supplying or being a final or conclusive settlement | Synonyms: definitive |
| determinative | (adjective) having the power or quality of deciding | Synonyms: deciding, determinant, determining |
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| determined | (adjective) having been learned or found or determined especially by investigation | - |
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| (adjective) strongly motivated to succeed | Synonyms: compulsive, driven |
| (adjective) characterized by great determination | - |
| (adjective) determined or decided upon as by an authority | Synonyms: dictated, set |
| (adjective) devoting full strength and concentrated attention to | - |
| determining | (adjective) having the power or quality of deciding | Synonyms: deciding, determinant, determinative |
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| deterministic | (adjective) an inevitable consequence of antecedent sufficient causes | - |
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| deterrent | (adjective) tending to deter | - |
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| detersive | (adjective) having cleansing power | Synonyms: detergent |
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| deuteranopic | (adjective) inability to see the color green or to distinguish green and purplish-red | Synonyms: green-blind |
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