| underestimation | (noun) an estimation that is too low; an estimate that is less than the true or actual value | Synonyms: underestimate, underrating, underreckoning |
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| underevaluation | (noun) an appraisal that underestimates the value of something | - |
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| underexpose | (verb) expose insufficiently | - |
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| (verb) expose to too little light | - |
| underexposure | (noun) the act of exposing film to too little light or for too short a time | - |
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| (noun) inadequate publicity | - |
| underfed | (adjective) not getting adequate food | Synonyms: ill-fed, undernourished |
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| underfelt | (noun) a carpet pad of thick felt | - |
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| underfoot | (adverb) under the feet | - |
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| (adverb) in the way and hindering progress | - |
| underframe | (noun) the internal supporting structure that gives an artifact its shape | Synonyms: frame, skeletal frame, skeleton |
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| underfur | (noun) thick soft fur lying beneath the longer and coarser guard hair | Synonyms: undercoat |
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| undergarment | (noun) a garment worn under other garments | Synonyms: unmentionable |
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| undergird | (verb) make secure underneath | Synonyms: brace up |
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| (verb) lend moral support to | - |
| undergo | (verb) go through | - |
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| undergrad | (noun) a university student who has not yet received a first degree | Synonyms: undergraduate |
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| undergraduate | (noun) a university student who has not yet received a first degree | Synonyms: undergrad |
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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 |
| (noun) an electric railway operating below the surface of the ground (usually in a city) | Synonyms: metro, subway, subway system, tube |
| (noun) a secret group organized to overthrow a government or occupation force | Synonyms: resistance |
| (adverb) beneath the surface of the earth | - |
| (adverb) in or into hiding or secret operation | - |
| undergrow | (verb) grow below something | - |
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| undergrowth | (noun) the brush (small trees and bushes and ferns etc.) growing beneath taller trees in a wood or forest | Synonyms: underbrush, underwood |
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| 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 |
| (adverb) with the hand swung below shoulder level | Synonyms: underarm |
| (adverb) slyly and secretly | Synonyms: underhandedly |
| 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 |
| underhandedly | (adverb) slyly and secretly | Synonyms: underhand |
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| 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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| underlay | (noun) a pad placed under a carpet | Synonyms: carpet pad, rug pad, underlayment |
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| (verb) provide with a base, support, lining, or backing | - |
| (verb) put (something) under or beneath | - |
| (verb) raise or support (the level of printing) by inserting a piece of paper or cardboard under the type | - |
| underlayment | (noun) a pad placed under a carpet | Synonyms: carpet pad, rug pad, underlay |
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| underlie | (verb) be or form the base for | - |
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| (verb) lie underneath | - |
| underline | (noun) a line drawn underneath (especially under written matter) | Synonyms: underscore |
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| (verb) give extra weight to (a communication) | Synonyms: emphasise, emphasize, underscore |
| (verb) draw a line or lines underneath to call attention to | Synonyms: underscore |
| underling | (noun) an assistant subject to the authority or control of another | Synonyms: foot soldier, subordinate, subsidiary |
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| underlip | (noun) the lower lip | - |
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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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| undermine | (verb) hollow out as if making a cave or opening | Synonyms: cave |
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| (verb) destroy property or hinder normal operations | Synonyms: counteract, countermine, sabotage, subvert, weaken |
| underneath | (adverb) under or below an object or a surface; at a lower place or level; directly beneath | - |
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| (adverb) on the lower or downward side; on the underside of | - |
| undernourish | (verb) provide with insufficient quality or quantity of nourishment | Synonyms: malnourish |
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| undernourished | (adjective) not getting adequate food | Synonyms: ill-fed, underfed |
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| 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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| underpay | (verb) pay too little | - |
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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 | - |
| underperform | (verb) perform too rarely | - |
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| (verb) perform less well or with less success than expected | Synonyms: underachieve |
| 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 |
| underpin | (verb) support from beneath | - |
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| (verb) support with evidence or authority or make more certain or confirm | Synonyms: bear out, corroborate, support |
| underplay | (verb) play a card lower than (a held high card) | - |
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| (verb) act (a role) with great restraint | Synonyms: underact |
| underpopulated | (adjective) having a lower population density than normal or desirable | - |
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| underprice | (verb) sell at artificially low prices | Synonyms: dump |
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| underprivileged | (adjective) lacking the rights and advantages of other members of society | - |
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| underproduce | (verb) produce below capacity or demand | - |
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| underproduction | (noun) inadequate production or less than expected | - |
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| underquote | (verb) quote a price lower than that quoted by (another seller) | - |
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| (verb) offer for sale at a price lower than the market price | - |
| underrate | (verb) make too low an estimate of | Synonyms: underestimate |
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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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| underrun | (verb) haul onto a boat | - |
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| (verb) run or pass below | - |
| underscore | (noun) a line drawn underneath (especially under written matter) | Synonyms: underline |
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| (verb) give extra weight to (a communication) | Synonyms: emphasise, emphasize, underline |
| (verb) draw a line or lines underneath to call attention to | Synonyms: underline |
| undersea | (adjective) beneath the surface of the sea | Synonyms: submarine |
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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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| undersealed | (adjective) (of motor vehicles) having a coating of tar or other rustproof material applied to the underside | Synonyms: undercoated |
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| undersecretary | (noun) a secretary immediately subordinate to the head of a department of government | - |
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| undersell | (verb) sell cheaper than one's competition | Synonyms: undercut |
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| underseller | (noun) a seller that sells at a lower price than others do | - |
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| undersexed | (adjective) having a subnormal degree of sexual desire | - |
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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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| undershoot | (verb) shoot short of or below (a target) | - |
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| (verb) fall short of (the runway) in a landing | - |
| undershot | (adjective) having a lower part projecting beyond the upper | Synonyms: underhung, underslung |
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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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| undersign | (verb) sign at the bottom of (a document) | - |
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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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| underskirt | (noun) undergarment worn under a skirt | Synonyms: half-slip, petticoat |
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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 | - |
| undersoil | (noun) the layer of soil between the topsoil and bedrock | Synonyms: subsoil |
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| underspend | (verb) spend at less than the normal rate | - |
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| (verb) spend less than the whole of (a budget, for example) | - |
| understaffed | (adjective) inadequate in number of workers or assistants etc. | Synonyms: short-handed, short-staffed, undermanned |
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| understand | (verb) know and comprehend the nature or meaning of | - |
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| (verb) perceive (an idea or situation) mentally | Synonyms: realise, realize, see |
| (verb) believe to be the case | Synonyms: infer |
| (verb) make sense of a language | Synonyms: interpret, read, translate |
| (verb) be understanding of | Synonyms: empathise, empathize, sympathise, sympathize |
| understandability | (noun) the quality of comprehensible language or thought | Synonyms: comprehensibility |
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| understandable | (adjective) capable of being apprehended or understood | Synonyms: apprehensible, graspable, intelligible, perceivable |
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| understandably | (adverb) in an intelligible manner | Synonyms: clearly, intelligibly |
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| understanding | (adjective) characterized by understanding based on comprehension and discernment and empathy | - |
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| (noun) the capacity for rational thought or inference or discrimination | Synonyms: intellect, reason |
| (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 |
| understandingly | (adverb) with understanding | - |
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| understate | (verb) represent as less significant or important | Synonyms: downplay, minimise, minimize |
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| understated | (adjective) exhibiting restrained good taste | Synonyms: unostentatious, unpretentious |
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| 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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| understock | (verb) stock with less than the usual or desirable number or quantity | - |
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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 |
| 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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| (verb) be an understudy or alternate for a role | Synonyms: alternate |
| undersurface | (noun) the lower side of anything | Synonyms: bottom, underside |
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| undertake | (verb) promise to do or accomplish | Synonyms: guarantee |
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| (verb) enter into a contractual arrangement | Synonyms: contract |
| (verb) enter upon an activity or enterprise | Synonyms: attempt, set about |
| (verb) accept as a charge | Synonyms: take in charge |
| (verb) accept as a challenge | Synonyms: tackle, take on |
| 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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| undervalue | (verb) lose in value | Synonyms: depreciate, devaluate, devalue |
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| (verb) assign too low a value to | Synonyms: underestimate |
| (verb) esteem lightly | - |