| undersea | (adjective) beneath the surface of the sea | Synonyms: submarine |
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| undersealed | (adjective) (of motor vehicles) having a coating of tar or other rustproof material applied to the underside | Synonyms: undercoated |
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| undersexed | (adjective) having a subnormal degree of sexual desire | - |
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| undershot | (adjective) having a lower part projecting beyond the upper | Synonyms: underhung, underslung |
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| undersize | (adjective) smaller than normal for its kind | Synonyms: undersized |
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| undersized | (adjective) smaller than normal for its kind | Synonyms: undersize |
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| underslung | (adjective) having a low center of gravity; built low to the ground | Synonyms: squat |
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| (adjective) having a lower part projecting beyond the upper | Synonyms: underhung, undershot |
| (adjective) supported from above especially in a vehicle having springs attached to the axle from below | - |
| understaffed | (adjective) inadequate in number of workers or assistants etc. | Synonyms: short-handed, short-staffed, undermanned |
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| understandable | (adjective) capable of being apprehended or understood | Synonyms: apprehensible, graspable, intelligible, perceivable |
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| understanding | (adjective) characterized by understanding based on comprehension and discernment and empathy | - |
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| understated | (adjective) exhibiting restrained good taste | Synonyms: unostentatious, unpretentious |
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| understood | (adjective) fully apprehended as to purport or meaning or explanation | - |
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| (adjective) implied by or inferred from actions or statements | Synonyms: silent, tacit |
| underwater | (adjective) growing or remaining under water | Synonyms: subaquatic, subaqueous, submerged, submersed |
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| (adjective) beneath the surface of the water | Synonyms: submerged, submersed |
| underway | (adjective) currently in progress | Synonyms: afoot |
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| underweight | (adjective) being very thin | Synonyms: boney, bony, scraggly, scraggy, scrawny, skinny, weedy |
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| undescended | (adjective) (of the testis) remaining in the abdomen instead of descending into the scrotum | - |
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| undescriptive | (adjective) not successful in describing | - |
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| undeserved | (adjective) not deserved or earned | - |
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| undeserving | (adjective) not deserving | Synonyms: unworthy |
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| undesigned | (adjective) not done or made or performed with purpose or intent | - |
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| undesirable | (adjective) not wanted | Synonyms: unwanted |
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| (adjective) not worthy of being chosen (especially as a spouse) | Synonyms: unsuitable |
| undesired | (adjective) not desired | Synonyms: unsought |
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| undesiring | (adjective) having or feeling no desire | Synonyms: undesirous |
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| undesirous | (adjective) having or feeling no desire | Synonyms: undesiring |
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| undestroyable | (adjective) very long lasting | Synonyms: durable, indestructible, perdurable |
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| (adjective) not capable of being destroyed | - |
| undetectable | (adjective) barely able to be perceived | Synonyms: indiscernible, insensible |
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| (adjective) not easily seen | - |
| undetected | (adjective) not perceived or discerned | - |
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| undeterminable | (adjective) not capable of being definitely decided or ascertained | Synonyms: indeterminable |
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| undetermined | (adjective) not yet having been ascertained or determined | - |
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| (adjective) not precisely determined or established; not fixed or known in advance | Synonyms: indeterminate |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: open, undecided, unresolved |
| undeterred | (adjective) not deterred | Synonyms: undiscouraged |
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| undeveloped | (adjective) not developed, mature, or fully formulated | - |
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| (adjective) not developed, improved, exploited or used | Synonyms: unexploited |
| undeviating | (adjective) going directly ahead from one point to another without veering or turning aside | Synonyms: unswerving |
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| (adjective) used of values and principles; not subject to change; steady | - |
| undiagnosable | (adjective) not possible to diagnose | - |
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| undiagnosed | (adjective) eluding diagnosis | - |
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| undifferentiated | (adjective) not differentiated | Synonyms: uniform |
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| undigested | (adjective) not digested | - |
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| (adjective) not thought over and arranged systematically in the mind; not absorbed or assimilated mentally | - |
| undignified | (adjective) lacking dignity | - |
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| undiluted | (adjective) not diluted | - |
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| undiminished | (adjective) not lessened or diminished | Synonyms: unrelieved |
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| undimmed | (adjective) not made dim or less bright | Synonyms: bright |
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| undiplomatic | (adjective) not skilled in dealing with others | - |
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| undirected | (adjective) aimlessly drifting | Synonyms: adrift, afloat, aimless, directionless, planless, rudderless |
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| undiscerning | (adjective) lacking discernment | - |
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| undischarged | (adjective) still capable of exploding or being fired | Synonyms: unexploded |
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| (adjective) owed as a debt | Synonyms: outstanding, owing |
| undisciplined | (adjective) lacking in discipline or control | Synonyms: ungoverned |
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| (adjective) not subjected to correction or discipline | Synonyms: uncorrected |
| (adjective) not subjected to discipline | - |
| undisclosed | (adjective) not made known | Synonyms: unrevealed |
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| undiscouraged | (adjective) not deterred | Synonyms: undeterred |
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| undiscoverable | (adjective) not able to be ascertained; resisting discovery | Synonyms: unascertainable |
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| undiscovered | (adjective) not discovered | - |
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| (adjective) not yet discovered | Synonyms: unexplored |
| undiscriminating | (adjective) not discriminating | Synonyms: indiscriminating |
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| undisguised | (adjective) plain to see | - |
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| undismayed | (adjective) unshaken in purpose | Synonyms: undaunted, unshaken |
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| undisputable | (adjective) not open to question; obviously true | Synonyms: incontestable, indisputable |
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| undisputed | (adjective) generally agreed upon; not subject to dispute | Synonyms: unchallenged, unquestioned |
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| undissolved | (adjective) retaining a solid form | - |
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| undistinguishable | (adjective) not capable of being distinguished or differentiated | Synonyms: indistinguishable |
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| undistinguished | (adjective) not special in any way; lacking distinction | Synonyms: mine run, run-of-the-mill, run-of-the-mine, unexceptional |
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| undistorted | (adjective) without alteration or misrepresentation | - |
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| undistributed | (adjective) (of investments) not distributed among a variety of securities | - |
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| undisturbed | (adjective) untroubled by interference or disturbance | - |
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| undiversified | (adjective) not diversified | - |
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| undividable | (adjective) cannot be divided without leaving a remainder | Synonyms: indivisible by |
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| undivided | (adjective) not divided among or brought to bear on more than one object or objective | Synonyms: exclusive, single |
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| (adjective) not parted by conflict of opinion | - |
| (adjective) not shared by or among others | - |
| (adjective) not separated into parts or shares; constituting an undivided unit | - |
| undoable | (adjective) impossible to achieve | Synonyms: unachievable, unattainable, unrealizable |
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| undocumented | (adjective) lacking necessary documents (as for e.g. permission to live or work in a country) | - |
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| undogmatic | (adjective) unwilling to accept authority or dogma (especially in religion) | Synonyms: free-thinking, latitudinarian, undogmatical |
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| undogmatical | (adjective) unwilling to accept authority or dogma (especially in religion) | Synonyms: free-thinking, latitudinarian, undogmatic |
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| undomestic | (adjective) not domestic or related to home | - |
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| undomesticated | (adjective) unaccustomed to home life | - |
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| (adjective) not domesticated | - |
| undone | (adjective) thrown into a state of disorganization or incoherence | Synonyms: unstuck |
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| (adjective) not fastened or tied or secured | - |
| (adjective) not done | - |
| (adjective) doomed to extinction | Synonyms: done for, ruined, sunk, washed-up |
| undrained | (adjective) not drained | - |
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| undramatic | (adjective) lacking dramatic force and quality | - |
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| undraped | (adjective) lacking drapery or draperies | - |
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| (adjective) stripped of drapery | - |
| undrawn | (adjective) not represented in a drawing | - |
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| undreamed | (adjective) not imagined even in a dream | Synonyms: undreamed of, undreamt, undreamt of, unimagined |
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| undreamt | (adjective) not imagined even in a dream | Synonyms: undreamed, undreamed of, undreamt of, unimagined |
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| undressed | (adjective) having removed clothing | Synonyms: unappareled, unattired, unclad, ungarbed, ungarmented |
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| (adjective) of lumber or stone or hides; not finished or dressed | - |
| undried | (adjective) still wet or moist | - |
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| undrinkable | (adjective) unsuitable for drinking | - |
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| undue | (adjective) not yet payable | - |
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| (adjective) not appropriate or proper (or even legal) in the circumstances | - |
| (adjective) beyond normal limits | Synonyms: excessive, inordinate, unreasonable |
| (adjective) lacking justification or authorization | Synonyms: unjustified, unwarranted |
| undulant | (adjective) resembling waves in form or outline or motion | Synonyms: undulatory |
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| undulate | (adjective) having a wavy margin and rippled surface | - |
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| undulatory | (adjective) resembling waves in form or outline or motion | Synonyms: undulant |
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| undutiful | (adjective) lacking due respect or dutifulness | Synonyms: impious |
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| undyed | (adjective) not artificially colored or bleached | Synonyms: unbleached, uncolored |
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| undying | (adjective) never dying | Synonyms: deathless |
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| undynamic | (adjective) characterized by an absence of force or forcefulness | Synonyms: adynamic |
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| uneager | (adjective) lacking interest or spirit or animation | - |
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| unearned | (adjective) not gained by merit or labor or service | - |
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| unearthly | (adjective) suggesting the operation of supernatural influences | Synonyms: eldritch, uncanny, weird |
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| (adjective) concerned with or affecting the spirit or soul | Synonyms: spiritual |
| uneasy | (adjective) lacking a sense of security or affording no ease or reassurance | - |
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| (adjective) lacking or not affording physical or mental rest | Synonyms: restless |
| (adjective) causing or fraught with or showing anxiety | Synonyms: anxious, nervous, queasy, unquiet |
| (adjective) relating to bodily unease that causes discomfort | - |
| (adjective) socially uncomfortable; unsure and constrained in manner | Synonyms: awkward, ill at ease |
| uneatable | (adjective) not suitable for food | Synonyms: inedible |
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| uneconomic | (adjective) wasteful of resources | Synonyms: uneconomical |
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| uneconomical | (adjective) inefficient in use of time and effort and materials | Synonyms: wasteful |
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| (adjective) wasteful of resources | Synonyms: uneconomic |
| unedifying | (adjective) not edifying | Synonyms: unenlightening |
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| unedited | (adjective) not changed by editing | - |
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| uneducated | (adjective) not having a good education | - |
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| uneffective | (adjective) not producing an intended effect | Synonyms: ineffective, ineffectual |
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| unelaborate | (adjective) not elaborate; lacking rich or complex detail | Synonyms: inelaborate |
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| unelaborated | (adjective) giving only major points; lacking completeness | Synonyms: sketchy |
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