| 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 |
| vender | (noun) someone who promotes or exchanges goods or services for money | Synonyms: marketer, seller, trafficker, vendor |
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| viewfinder | (noun) optical device that helps a user to find the target of interest | Synonyms: finder, view finder |
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| wanderer | (noun) a computer program that prowls the internet looking for publicly accessible resources that can be added to a database; the database can then be searched with a search engine | Synonyms: spider |
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| (noun) someone who leads a wandering unsettled life | Synonyms: bird of passage, roamer, rover |
| wandering | (noun) travelling about without any clear destination | Synonyms: roving, vagabondage |
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| wanderlust | (noun) very strong or irresistible impulse to travel | Synonyms: itchy feet |
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| waterfinder | (noun) forked stick that is said to dip down to indicate underground water or oil | Synonyms: divining rod, dowser, dowsing rod, water finder |
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| weekender | (noun) a small suitcase to carry clothing and accessories for a weekend trip | - |
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| (noun) someone who vacations on a weekend | - |
| winder | (noun) mechanical device around which something can be wound | - |
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| (noun) mechanical device used to wind another device that is driven by a spring (as a clock) | Synonyms: key |
| (noun) a worker who winds (e.g., a winch or clock or other mechanism) | - |
| withstander | (noun) an opponent who resists with force or resolution | - |
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| (noun) a fighter who holds out against attack | Synonyms: defender |
| wonder | (noun) a state in which you want to learn more about something | Synonyms: curiosity |
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| (noun) something that causes feelings of wonder | Synonyms: marvel |
| (noun) the feeling aroused by something strange and surprising | Synonyms: admiration, wonderment |
| wonderberry | (noun) improved garden variety of black nightshade having small edible orange or black berries | Synonyms: garden huckleberry, Solanum burbankii, Solanum melanocerasum, Solanum nigrum guineese, sunberry |
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| wonderer | (noun) someone filled with admiration and awe; someone who wonders at something | Synonyms: marveller |
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| (noun) someone who is curious about something | - |
| wonderfulness | (noun) admirable excellence | Synonyms: admirability, admirableness |
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| wonderland | (noun) an imaginary realm of marvels or wonders | - |
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| (noun) a place or scene of great or strange beauty or wonder | - |
| wonderment | (noun) the feeling aroused by something strange and surprising | Synonyms: admiration, wonder |
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| wordfinder | (noun) a thesaurus organized to help you find the word you want but cannot think of | Synonyms: word finder |
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