| undernourishment | (noun) not having enough food to develop or function normally | Synonyms: malnourishment |
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| underpants | (noun) an undergarment that covers the body from the waist no further than to the thighs; usually worn next to the skin | - |
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| underpart | (noun) a part lying on the lower side or underneath an animal's body | - |
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| underpass | (noun) an underground tunnel or passage enabling pedestrians to cross a road or railway | Synonyms: subway |
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| underpayment | (noun) the act of paying less than required | - |
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| (noun) a payment smaller than needed or expected | - |
| underperformer | (noun) a business that is less successful than expected | - |
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| (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: nonachiever, underachiever |
| underproduction | (noun) inadequate production or less than expected | - |
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| underrating | (noun) an estimation that is too low; an estimate that is less than the true or actual value | Synonyms: underestimate, underestimation, underreckoning |
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| underreckoning | (noun) an estimation that is too low; an estimate that is less than the true or actual value | Synonyms: underestimate, underestimation, underrating |
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| underscore | (noun) a line drawn underneath (especially under written matter) | Synonyms: underline |
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| underseal | (noun) seal consisting of a coating of a tar or rubberlike material on the underside of a motor vehicle to retard corrosion | Synonyms: undercoat |
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| undersecretary | (noun) a secretary immediately subordinate to the head of a department of government | - |
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| underseller | (noun) a seller that sells at a lower price than others do | - |
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| undershirt | (noun) a collarless men's undergarment for the upper part of the body | Synonyms: singlet, vest |
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| undershrub | (noun) a low shrub | - |
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| underside | (noun) the lower side of anything | Synonyms: bottom, undersurface |
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| underskirt | (noun) undergarment worn under a skirt | Synonyms: half-slip, petticoat |
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| undersoil | (noun) the layer of soil between the topsoil and bedrock | Synonyms: subsoil |
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| understandability | (noun) the quality of comprehensible language or thought | Synonyms: comprehensibility |
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| understanding | (noun) the capacity for rational thought or inference or discrimination | Synonyms: intellect, reason |
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| (noun) the cognitive condition of someone who understands | Synonyms: apprehension, discernment, savvy |
| (noun) an inclination to support or be loyal to or to agree with an opinion | Synonyms: sympathy |
| (noun) the statement (oral or written) of an exchange of promises | Synonyms: agreement |
| understatement | (noun) a statement that is restrained in ironic contrast to what might have been said | - |
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| understeer | (noun) when a car steers less than (under) the amount commanded by the driver. | - |
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| understructure | (noun) lowest support of a structure | Synonyms: base, foot, foundation, fundament, groundwork, substructure |
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| understudy | (noun) an actor able to replace a regular performer when required | Synonyms: standby |
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| undersurface | (noun) the lower side of anything | Synonyms: bottom, underside |
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| undertaker | (noun) one whose business is the management of funerals | Synonyms: funeral director, funeral undertaker, mortician |
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| undertaking | (noun) any piece of work that is undertaken or attempted | Synonyms: labor, labour, project, task |
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| (noun) the trade of a funeral director | - |
| undertide | (noun) a current below the surface of a fluid | Synonyms: undercurrent |
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| undertone | (noun) a pale or subdued color | Synonyms: tinge |
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| (noun) a subdued emotional quality underlying an utterance; implicit meaning | Synonyms: undercurrent |
| (noun) a quiet or hushed tone of voice | - |
| undertow | (noun) the seaward undercurrent created after waves have broken on the shore | Synonyms: sea-poose, sea-purse, sea-puss, sea purse, sea puss |
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| (noun) an inclination contrary to the strongest or prevailing feeling | - |
| undervaluation | (noun) too low a value or price assigned to something | - |
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| underwear | (noun) undergarment worn next to the skin and under the outer garments | Synonyms: underclothes, underclothing |
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| underwing | (noun) moth having dull forewings and brightly colored hind wings | - |
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| underwood | (noun) the brush (small trees and bushes and ferns etc.) growing beneath taller trees in a wood or forest | Synonyms: underbrush, undergrowth |
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| underworld | (noun) (religion) the world of the dead | Synonyms: Hades, Hell, infernal region, netherworld, Scheol |
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| (noun) the criminal class | - |
| underwriter | (noun) a financial institution that sells insurance | Synonyms: insurance company, insurance firm, insurance underwriter, insurer |
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| (noun) a banker who deals chiefly in underwriting new securities | Synonyms: investment banker |
| (noun) an agent who sells insurance | Synonyms: general agent, insurance agent, insurance broker |
| undesirability | (noun) the quality possessed by something that should be avoided | - |
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| undesirable | (noun) one whose presence is undesirable | - |
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| undies | (noun) women's underwear | - |
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| undine | (noun) any of various female water spirits | - |
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| undiscipline | (noun) the trait of lacking discipline | Synonyms: indiscipline |
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| undoer | (noun) a person who destroys or ruins or lays waste to | Synonyms: destroyer, ruiner, uprooter, waster |
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| (noun) a person who unfastens or unwraps or opens | Synonyms: opener, unfastener, untier |
| (noun) a seducer who ruins a woman | - |
| undoing | (noun) an act that makes a previous act of no effect (as if not done) | - |
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| (noun) loosening the ties that fasten something | Synonyms: unfastening, untying |
| undress | (noun) partial or complete nakedness | - |
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| undulation | (noun) (physics) a movement up and down or back and forth | Synonyms: wave |
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| (noun) wavelike motion; a gentle rising and falling in the manner of waves | - |
| (noun) an undulating curve | Synonyms: wave |
| undutifulness | (noun) impiety characterized by lack of devotion to duty | - |
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| unease | (noun) the trait of seeming ill at ease | Synonyms: disquiet, uneasiness |
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| (noun) physical discomfort (as mild sickness or depression) | Synonyms: malaise, uneasiness |
| uneasiness | (noun) inability to rest or relax or be still | Synonyms: queasiness, restlessness |
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| (noun) the trait of seeming ill at ease | Synonyms: disquiet, unease |
| (noun) embarrassment deriving from the feeling that others are critically aware of you | Synonyms: self-consciousness, uncomfortableness |
| (noun) feelings of anxiety that make you tense and irritable | Synonyms: disquietude, edginess, inquietude |
| (noun) physical discomfort (as mild sickness or depression) | Synonyms: malaise, unease |
| unemotionality | (noun) absence of emotion | Synonyms: emotionlessness |
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| (noun) apathy demonstrated by an absence of emotional reactions | Synonyms: emotionlessness, impassiveness, impassivity, indifference, phlegm, stolidity |
| unemployed | (noun) people who are involuntarily out of work (considered as a group) | Synonyms: unemployed people |
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| unemployment | (noun) the state of being unemployed or not having a job | - |
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| unenlightenment | (noun) a lack of understanding | - |
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| unequivocalness | (noun) clarity achieved by the avoidance of ambiguity | Synonyms: unambiguity |
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| unevenness | (noun) the quality of being uneven and lacking uniformity | Synonyms: variability |
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| (noun) the quality of being unbalanced | - |
| unexchangeability | (noun) the quality of being incapable of exchange or interchange | - |
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| unexpectedness | (noun) extraordinariness by virtue of being unexpected | Synonyms: surprisingness |
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| unfairness | (noun) an unjust act | Synonyms: iniquity, injustice, shabbiness |
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| (noun) injustice by virtue of not conforming with rules or standards | Synonyms: inequity |
| (noun) partiality that is not fair or equitable | - |
| unfaithfulness | (noun) the quality of being unfaithful | Synonyms: infidelity |
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| unfamiliarity | (noun) unusualness as a consequence of not being well known | Synonyms: strangeness |
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| unfastener | (noun) a person who unfastens or unwraps or opens | Synonyms: opener, undoer, untier |
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| unfastening | (noun) loosening the ties that fasten something | Synonyms: undoing, untying |
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| unfavorableness | (noun) the quality of not being encouraging or indicative of success | Synonyms: unfavourableness |
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| unfavourableness | (noun) the quality of not being encouraging or indicative of success | Synonyms: unfavorableness |
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| unfeasibility | (noun) the quality of not being doable | Synonyms: infeasibility |
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| unfeelingness | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callosity, callousness, hardness, insensibility |
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| unfitness | (noun) the quality of not being suitable | - |
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| (noun) lacking the power to perform | Synonyms: inability |
| (noun) poor physical condition; being out of shape or out of condition (as from a life of ease and luxury) | Synonyms: softness |
| unfolding | (noun) a developmental process | Synonyms: flowering |
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| unforgivingness | (noun) The quality of having no allowance for weakness. | - |
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| unfortunate | (noun) a person who suffers misfortune | Synonyms: unfortunate person |
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| unfriendliness | (noun) an unfriendly disposition | - |
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| (noun) dislike experienced as an absence of friendliness | - |
| ungainliness | (noun) the carriage of someone whose movements and posture are extremely ungainly and inelegant | Synonyms: gawkiness |
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| ungodliness | (noun) impiety by virtue of not being a godly person | Synonyms: godlessness |
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| ungracefulness | (noun) an unpleasant lack of grace in carriage or form or movement or expression | Synonyms: gracelessness |
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| ungraciousness | (noun) an offensive lack of good manners | - |
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| ungrammaticality | (noun) The state or quality of not following rules of grammar. | - |
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| ungratefulness | (noun) a lack of gratitude | Synonyms: ingratitude |
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| unguent | (noun) semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation | Synonyms: balm, ointment, salve, unction |
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| unguiculate | (noun) a mammal having nails or claws | Synonyms: unguiculate mammal |
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| unguis | (noun) any rigid body structure composed primarily of keratin | Synonyms: horny structure |
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| ungulate | (noun) any of a number of mammals with hooves that are superficially similar but not necessarily closely related taxonomically | Synonyms: hoofed mammal |
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| unhappiness | (noun) emotions experienced when not in a state of well-being | Synonyms: sadness |
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| (noun) state characterized by emotions ranging from mild discontentment to deep grief | - |
| unhealthfulness | (noun) the quality of promoting poor health | - |
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| unhealthiness | (noun) a state in which you are unable to function normally and without pain | Synonyms: health problem, ill health |
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| unhelpfulness | (noun) an inability to be helpful | - |
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| unholiness | (noun) the quality of being unholy | - |
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| unhurriedness | (noun) a rate demonstrating an absence of haste or hurry | Synonyms: deliberateness, deliberation, slowness |
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| unicorn | (noun) an imaginary creature represented as a white horse with a long horn growing from its forehead | - |
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| unicycle | (noun) a vehicle with a single wheel that is driven by pedals | Synonyms: monocycle |
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| unicyclist | (noun) a person who rides a unicycle | - |
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| unification | (noun) the act of making or becoming a single unit | Synonyms: conjugation, jointure, union, uniting |
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| (noun) an occurrence that involves the production of a union | Synonyms: fusion, merger |
| (noun) the state of being joined or united or linked | Synonyms: union |
| uniform | (noun) clothing of distinctive design worn by members of a particular group as a means of identification | - |
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| uniformity | (noun) the quality of lacking diversity or variation (even to the point of boredom) | Synonyms: uniformness |
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| (noun) a condition in which everything is regular and unvarying | - |
| uniformness | (noun) the quality of lacking diversity or variation (even to the point of boredom) | Synonyms: uniformity |
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| unilateralism | (noun) the doctrine that nations should conduct their foreign affairs individualistically without the advice or involvement of other nations | - |
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| unilateralist | (noun) an advocate of unilateralism | - |
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| unilaterality | (noun) The state or quality of being unilateral; one-sidedness. | - |
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| unimportance | (noun) the quality of not being important or worthy of note | - |
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| (noun) the state of being humble and unimportant | Synonyms: humbleness, lowliness, obscureness |
| uninitiate | (noun) people who have not been introduced to the mysteries of some field or activity | - |
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| uninsurability | (noun) the quality of being uninsurable; the conditions under which an insurance company will refuse to issue insurance to an applicant (based on standards set by the insurance company) | - |
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| unintelligibility | (noun) incomprehensibility as a consequence of being unintelligible | - |
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| (noun) nonsense that is simply incoherent and unintelligible | Synonyms: incoherence, incoherency |