| 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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| 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 |