| uncontrolled | (adjective) not being under control; out of control | - |
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| uncontroversial | (adjective) not likely to arouse controversy | Synonyms: noncontroversial |
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| unconventional | (adjective) not conforming to accepted rules or standards | - |
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| (adjective) not conventional or conformist | - |
| (adjective) not conforming to legality, moral law, or social convention | Synonyms: improper, unlawful |
| unconverted | (adjective) not converted | Synonyms: unpersuaded |
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| unconvertible | (adjective) used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value | Synonyms: inconvertible, unexchangeable |
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| unconvinced | (adjective) lacking conviction | - |
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| unconvincing | (adjective) not convincing | Synonyms: flimsy |
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| (adjective) having a probability too low to inspire belief | Synonyms: improbable, unbelievable, unlikely |
| uncooked | (adjective) not cooked | - |
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| uncool | (adjective) (spoken slang) unfashionable and boring | - |
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| uncooperative | (adjective) unwilling to cooperate | - |
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| (adjective) intentionally unaccommodating | Synonyms: disobliging |
| uncoordinated | (adjective) lacking the skillful and effective interaction of muscle movements | - |
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| (adjective) lacking in cooperative planning and organization | - |
| uncordial | (adjective) lacking warmth or friendliness | - |
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| uncorrectable | (adjective) incapable of being controlled or managed | Synonyms: uncontrollable, unmanageable |
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| uncorrected | (adjective) left faulty or wrong | - |
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| (adjective) not subjected to correction or discipline | Synonyms: undisciplined |
| uncorrelated | (adjective) not varying together | - |
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| uncorroborated | (adjective) unsupported by other evidence | Synonyms: unsubstantiated |
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| uncorrupted | (adjective) (of language) not having its purity or excellence debased | Synonyms: undefiled |
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| (adjective) not debased | - |
| (adjective) not decayed or decomposed | Synonyms: unspoiled |
| uncounted | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, innumerous, multitudinous, myriad, numberless, unnumberable, unnumbered, unnumerable |
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| uncoupled | (adjective) having the coupling undone | - |
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| uncousinly | (adjective) not befitting a cousin | - |
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| uncouth | (adjective) lacking refinement or cultivation or taste | Synonyms: coarse, common, rough-cut, vulgar |
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| uncovered | (adjective) not covered with clothing | Synonyms: exposed |
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| uncrannied | (adjective) without chinks or crannies | - |
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| uncreased | (adjective) used especially of fabrics | Synonyms: creaseless |
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| uncreative | (adjective) not creative | - |
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| uncritical | (adjective) not critical; not tending to find or call attention to errors | - |
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| (adjective) marked by disregard for critical standards or procedures | Synonyms: noncritical |
| uncropped | (adjective) not used for growing crops | - |
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| uncrossed | (adjective) not crossed | - |
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| (adjective) (of a check) not crossed | - |
| uncrowded | (adjective) having or allowing sufficient room | - |
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| uncrowned | (adjective) not (especially not yet) provided with a crown | Synonyms: crownless |
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| (adjective) not having an (artificial) crown on a tooth; used especially of molars and bicuspids | - |
| uncrystallised | (adjective) not finally or definitely formed | Synonyms: uncrystallized |
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| (adjective) without real or apparent crystalline form | Synonyms: amorphous, uncrystallized |
| uncrystallized | (adjective) not finally or definitely formed | Synonyms: uncrystallised |
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| (adjective) without real or apparent crystalline form | Synonyms: amorphous, uncrystallised |
| unctuous | (adjective) unpleasantly and excessively suave or ingratiating in manner or speech | Synonyms: buttery, fulsome, oily, oleaginous, smarmy, soapy |
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| uncultivable | (adjective) not suitable for cultivation or tilling | Synonyms: uncultivatable |
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| uncultivatable | (adjective) not suitable for cultivation or tilling | Synonyms: uncultivable |
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| uncultivated | (adjective) (of land or fields) not prepared for raising crops | - |
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| (adjective) characteristic of a person who is not cultivated or does not have intellectual tastes | Synonyms: lowbrow, lowbrowed |
| (adjective) (of persons) lacking art or knowledge | Synonyms: artless, uncultured |
| uncultured | (adjective) (of persons) lacking art or knowledge | Synonyms: artless, uncultivated |
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| uncurbed | (adjective) not restrained or controlled | Synonyms: unbridled, unchecked, ungoverned |
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| uncured | (adjective) not seasoned | - |
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| uncurled | (adjective) not having been curled | - |
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| (adjective) not curled | - |
| uncurtained | (adjective) not provided with curtains | Synonyms: curtainless |
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| uncurved | (adjective) having no curves | Synonyms: uncurving |
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| uncurving | (adjective) having no curves | Synonyms: uncurved |
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| uncut | (adjective) not cut | - |
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| (adjective) (of pages of a book) having adjacent leaves still joined at the fore edge | - |
| (adjective) not shaped by cutting or trimming | Synonyms: rough |
| (adjective) (used of grass or vegetation) not cut down with a hand implement or machine | Synonyms: unmown |
| (adjective) not trimmed | Synonyms: untrimmed |
| (adjective) complete | Synonyms: full-length |
| (adjective) not injured by cutting | - |
| undamaged | (adjective) not harmed or spoiled; sound | - |
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| undatable | (adjective) not capable of being given a date | - |
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| undated | (adjective) not bearing a date | Synonyms: dateless |
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| undaunted | (adjective) resolutely courageous | - |
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| (adjective) unshaken in purpose | Synonyms: undismayed, unshaken |
| undeceived | (adjective) freed of a mistaken or misguided notion | Synonyms: disabused |
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| undecideable | (adjective) not capable of being decided as following or not following from the axioms of a logical system | - |
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| undecided | (adjective) characterized by indecision | Synonyms: on the fence |
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| (adjective) not yet having made a commitment | - |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: open, undetermined, unresolved |
| undecipherable | (adjective) not easily deciphered | Synonyms: indecipherable, unclear, unreadable |
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| undeciphered | (adjective) not deciphered | - |
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| undeclared | (adjective) not announced or openly acknowledged | - |
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| undecomposable | (adjective) representing the furthest possible extent of analysis or division into parts | Synonyms: unanalyzable |
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| undecomposed | (adjective) not decayed | Synonyms: incorrupt |
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| undecorated | (adjective) not decorated with something to increase its beauty or distinction | Synonyms: unadorned |
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| undedicated | (adjective) not dedicated | - |
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| undefeated | (adjective) victorious | - |
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| undefendable | (adjective) not defended or capable of being defended | Synonyms: assailable, open, undefended |
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| undefended | (adjective) not defended or capable of being defended | Synonyms: assailable, open, undefendable |
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| undeferential | (adjective) not showing courteous respect | - |
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| undefiled | (adjective) (of language) not having its purity or excellence debased | Synonyms: uncorrupted |
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| (adjective) free from stain or blemish | Synonyms: immaculate |
| undefinable | (adjective) not capable of being precisely or readily described; not easily put into words | Synonyms: indefinable |
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| undefined | (adjective) not precisely limited, determined, or distinguished | Synonyms: vague |
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| undelineated | (adjective) not represented accurately or precisely | - |
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| undemanding | (adjective) requiring little if any patience or effort or skill | - |
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| undemocratic | (adjective) not in agreement with or according to democratic doctrine or practice or ideals | - |
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| undemonstrative | (adjective) not given to open expression of emotion | - |
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| undeniable | (adjective) not possible to deny | - |
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| undenominational | (adjective) not bound or devoted to the promotion of a particular denomination | - |
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| undependable | (adjective) not worthy of reliance or trust | Synonyms: unreliable |
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| (adjective) liable to be erroneous or misleading | Synonyms: unreliable |
| undepicted | (adjective) not pictured | Synonyms: unpictured |
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| under | (adjective) located below or beneath something else | Synonyms: nether |
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| (adjective) lower in rank, power, or authority | - |
| underactive | (adjective) abnormally inactive | Synonyms: hypoactive |
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| underage | (adjective) not of legal age | Synonyms: minor, nonaged |
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| (adjective) dependent by virtue of youth | - |
| underarm | (adjective) with hand brought forward and up from below shoulder level | Synonyms: underhand, underhanded |
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| underbred | (adjective) of inferior or mixed breed | - |
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| (adjective) (of persons) lacking in refinement or grace | Synonyms: bounderish, ill-bred, lowbred, rude, yokelish |
| underclass | (adjective) belonging to the lowest and least privileged social stratum | - |
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| underclothed | (adjective) inadequately clothed | Synonyms: half-clothed, scantily clad |
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| undercoated | (adjective) (of motor vehicles) having a coating of tar or other rustproof material applied to the underside | Synonyms: undersealed |
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| undercover | (adjective) conducted with or marked by hidden aims or methods | Synonyms: clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, underground |
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| underdeveloped | (adjective) not yet fully developed | - |
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| (adjective) relating to societies in which capital needed to industrialize is in short supply | Synonyms: developing |
| underdone | (adjective) insufficiently cooked | Synonyms: half-baked |
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| underdressed | (adjective) inadequately or too informally clothed | - |
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| undereducated | (adjective) poorly or insufficiently educated | - |
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| underemployed | (adjective) employed only part-time when one needs full-time employment or not making full use of your skills | - |
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| underfed | (adjective) not getting adequate food | Synonyms: ill-fed, undernourished |
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| underground | (adjective) conducted with or marked by hidden aims or methods | Synonyms: clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover |
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| (adjective) under the level of the ground | Synonyms: belowground |
| underhand | (adjective) with hand brought forward and up from below shoulder level | Synonyms: underarm, underhanded |
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| (adjective) marked by deception | Synonyms: sneaky, underhanded |
| underhanded | (adjective) with hand brought forward and up from below shoulder level | Synonyms: underarm, underhand |
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| (adjective) marked by deception | Synonyms: sneaky, underhand |
| underhung | (adjective) having a lower part projecting beyond the upper | Synonyms: undershot, underslung |
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| (adjective) supported from below especially resting on a track instead of suspended from above | - |
| underivative | (adjective) not derivative or imitative | - |
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| underived | (adjective) not derived; primary or simple | - |
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| underlying | (adjective) being or involving basic facts or principles | Synonyms: fundamental, rudimentary |
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| (adjective) in the nature of something though not readily apparent | Synonyms: implicit in, inherent |
| (adjective) located beneath or below | - |
| undermanned | (adjective) inadequate in number of workers or assistants etc. | Synonyms: short-handed, short-staffed, understaffed |
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| undermentioned | (adjective) about to be mentioned or specified | Synonyms: following |
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| undernourished | (adjective) not getting adequate food | Synonyms: ill-fed, underfed |
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| underpopulated | (adjective) having a lower population density than normal or desirable | - |
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| underprivileged | (adjective) lacking the rights and advantages of other members of society | - |
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