| thunderhead | (noun) a rounded projecting mass of a cumulus cloud with shining edges; often appears before a thunderstorm | - |
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| thundering | (adjective) extraordinarily big or impressive | - |
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| (adjective) sounding like thunder | - |
| thunderous | (adjective) loud enough to cause (temporary) hearing loss | Synonyms: deafening, earsplitting, thundery |
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| (adjective) extremely ominous | - |
| thunderousness | (noun) The state or condition of being very loud, suggestive of thunder; booming loudness. | - |
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| thundershower | (noun) a short rainstorm accompanied by thunder and lightning | - |
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| thunderstorm | (noun) a storm resulting from strong rising air currents; heavy rain or hail along with thunder and lightning | Synonyms: electric storm, electrical storm |
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| thunderstruck | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbfounded, dumbstricken, dumbstruck, dumfounded, flabbergasted, stupefied |
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| thundery | (adjective) loud enough to cause (temporary) hearing loss | Synonyms: deafening, earsplitting, thunderous |
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| (adjective) accompanied with thunder | - |
| tinder | (noun) material for starting a fire | Synonyms: kindling, punk, spunk, touchwood |
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| tinderbox | (noun) a box for holding tinder | - |
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| (noun) a dangerous state of affairs; a situation that is a potential source of violence | - |
| transgender | (adjective) involving a partial or full reversal of gender | Synonyms: transgendered |
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| transgendered | (adjective) involving a partial or full reversal of gender | Synonyms: transgender |
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| (noun) a person who has undergone a sex change operation | Synonyms: transexual, transsexual |
| transponder | (noun) electrical device designed to receive a specific signal and automatically transmit a specific reply | - |
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| tsundere | (noun) a person who is initially cold and even hostile towards another person before gradually showing a warmer side over time. | - |
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| (noun) a character development process that describes a person who is initially cold and even hostile towards another person before gradually showing a warmer side over time. | - |
| under | (adjective) located below or beneath something else | Synonyms: nether |
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| (adjective) lower in rank, power, or authority | - |
| (adverb) further down | Synonyms: below |
| (adverb) down below | - |
| (adverb) below the horizon | - |
| (adverb) below some quantity or limit | - |
| (adverb) in or into a state of subordination or subjugation | - |
| (adverb) down to defeat, death, or ruin | - |
| (adverb) into unconsciousness | - |
| (adverb) through a range downward | - |
| underachieve | (verb) perform less well or with less success than expected | Synonyms: underperform |
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| underachievement | (noun) poorer than expected performance (poorer than might have been predicted from intelligence tests) | - |
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| underachiever | (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: nonachiever, underperformer |
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| underact | (verb) act (a role) with great restraint | Synonyms: underplay |
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| 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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| (adverb) with the hand swung below shoulder level | Synonyms: underhand |
| underbelly | (noun) the quality of being weak or unprotected | - |
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| (noun) the soft belly or underside of an animal's body | Synonyms: underbody |
| (noun) lower side | - |
| underbid | (verb) bid too low | - |
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| (verb) bid lower than a competing bidder | - |
| (verb) bid (a hand of cards) at less than the strength of the hand warrants | - |
| underbodice | (noun) a short sleeveless undergarment for women | Synonyms: camisole |
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| underbody | (noun) the soft belly or underside of an animal's body | Synonyms: underbelly |
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| underboss | (noun) an assistant or second-in-command to a chief (especially in a crime syndicate) | - |
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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 |
| underbrush | (noun) the brush (small trees and bushes and ferns etc.) growing beneath taller trees in a wood or forest | Synonyms: undergrowth, underwood |
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| undercarriage | (noun) framework that serves as a support for the body of a vehicle | - |
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| undercharge | (noun) an insufficient charge | - |
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| (noun) a price that is too low | - |
| (verb) charge (someone) too little money | - |
| underclass | (adjective) belonging to the lowest and least privileged social stratum | - |
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| (noun) the social class lowest in the social hierarchy | Synonyms: lower class |
| underclassman | (noun) an undergraduate who is not yet a senior | Synonyms: lowerclassman |
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| underclothed | (adjective) inadequately clothed | Synonyms: half-clothed, scantily clad |
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| underclothes | (noun) undergarment worn next to the skin and under the outer garments | Synonyms: underclothing, underwear |
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| underclothing | (noun) undergarment worn next to the skin and under the outer garments | Synonyms: underclothes, underwear |
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| undercoat | (noun) thick soft fur lying beneath the longer and coarser guard hair | Synonyms: underfur |
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| (noun) the first or preliminary coat of paint or size applied to a surface | Synonyms: flat coat, ground, primer, primer coat, priming, priming coat |
| (noun) seal consisting of a coating of a tar or rubberlike material on the underside of a motor vehicle to retard corrosion | Synonyms: underseal |
| (verb) cover with a primer; apply a primer to | Synonyms: ground, prime |
| 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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| undercurrent | (noun) a subdued emotional quality underlying an utterance; implicit meaning | Synonyms: undertone |
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| (noun) a current below the surface of a fluid | Synonyms: undertide |
| undercut | (noun) (sports) a stroke that puts reverse spin on the ball | Synonyms: cut |
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| (noun) a cut made underneath to remove material | - |
| (noun) a notch cut in the trunk of tree in order to determine the direction of its fall | - |
| (noun) the tender meat of the loin muscle on each side of the vertebral column | Synonyms: tenderloin |
| (noun) the material removed by a cut made underneath | - |
| (verb) strike (the ball) in golf, tennis, or hockey obliquely downward so as to give a backspin or elevation to the shot | - |
| (verb) cut away the underpart of | - |
| (verb) cut away material from the underside of (an object) so as to leave an overhanging portion in relief | - |
| (verb) cut obliquely into (a tree) below the main cut and on the side toward which the tree will fall | - |
| (verb) sell cheaper than one's competition | Synonyms: undersell |
| underdevelop | (verb) process (a film or photographic plate) less than the required time or in an ineffective solution or at an insufficiently high temperature | - |
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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 |
| underdevelopment | (noun) (photography) inadequate processing of film resulting in inadequate contrast | - |
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| (noun) state of inadequate development | - |
| underdog | (noun) one at a disadvantage and expected to lose | - |
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| underdone | (adjective) insufficiently cooked | Synonyms: half-baked |
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| underdrawers | (noun) underpants worn by men | Synonyms: boxers, boxershorts, drawers, shorts |
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| underdress | (verb) dress informally and casually | Synonyms: dress down |
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| (verb) dress without sufficient warmth | - |
| 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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| underestimate | (noun) an estimation that is too low; an estimate that is less than the true or actual value | Synonyms: underestimation, underrating, underreckoning |
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| (verb) make a deliberately low estimate | Synonyms: lowball |
| (verb) make too low an estimate of | Synonyms: underrate |
| (verb) assign too low a value to | Synonyms: undervalue |
| 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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