| supertwister | (noun) the most powerful tornado which can create enormously devastating damage | - |
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| suppertime | (noun) the customary or habitual hour for the evening meal | Synonyms: dinnertime |
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| teetertotter | (noun) a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either end | Synonyms: dandle board, seesaw, teeter-totter, teeter, teeterboard, tilting board |
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| (verb) ride on a plank | Synonyms: seesaw, teeter-totter |
| terahertz | (noun) one trillion periods per second | Synonyms: THz |
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| tertian | (adjective) relating to symptoms (especially malarial fever) that appear every other day | - |
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| (adjective) of or relating to a tonal system based on major thirds | - |
| tertiary | (adjective) coming next after the second and just before the fourth in position | Synonyms: 3rd, third |
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| tertigravida | (noun) a woman who is pregnant for the third time | Synonyms: gravida III |
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| unalert | (adjective) not alert to what is potentially dangerous | Synonyms: unvigilant, unwatchful |
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| unascertainable | (adjective) not able to be ascertained; resisting discovery | Synonyms: undiscoverable |
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| unassertive | (adjective) inclined to timidity or lack of self-confidence | - |
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| unassertively | (adverb) in an unassertive manner | - |
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| unassertiveness | (noun) diffidence about self promotion | - |
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| uncertain | (adjective) not established beyond doubt; still undecided or unknown | - |
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| (adjective) lacking or indicating lack of confidence or assurance | Synonyms: incertain, unsure |
| (adjective) not certain to occur; not inevitable | - |
| (adjective) not established or confirmed | Synonyms: unsealed |
| (adjective) ambiguous (especially in the negative) | - |
| (adjective) not consistent or dependable | - |
| (adjective) subject to change | Synonyms: changeable, unsettled |
| uncertainly | (adverb) showing lack of certainty | - |
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| (adverb) in an unsteady manner | Synonyms: falteringly, unsteadily |
| uncertainness | (noun) being unsettled or in doubt or dependent on chance | Synonyms: precariousness, uncertainty |
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| uncertainty | (noun) being unsettled or in doubt or dependent on chance | Synonyms: precariousness, uncertainness |
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| (noun) the state of being unsure of something | Synonyms: doubt, doubtfulness, dubiety, dubiousness, incertitude |
| uncertified | (adjective) lacking requisite official documentation or endorsement | - |
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| unconverted | (adjective) not converted | Synonyms: unpersuaded |
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| unconvertible | (adjective) used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value | Synonyms: inconvertible, unexchangeable |
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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 | - |
| unfertile | (adjective) incapable of reproducing | Synonyms: infertile, sterile |
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| unfertilised | (adjective) not having been fertilized | Synonyms: unfertilized, unimpregnated |
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| unfertilized | (adjective) not having been fertilized | Synonyms: unfertilised, unimpregnated |
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| unperturbed | (adjective) free from emotional agitation or nervous tension | Synonyms: unflurried, unflustered, unruffled |
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| vertebra | (noun) one of the bony segments of the spinal column | - |
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| vertebral | (adjective) of or relating to or constituting vertebrae | - |
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| vertebrate | (adjective) having a backbone or spinal column | - |
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| (noun) animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium | Synonyms: craniate |
| vertex | (noun) the point of intersection of lines or the point opposite the base of a figure | - |
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| (noun) the highest point (of something) | Synonyms: acme, apex, peak |
| vertical | (adjective) at right angles to the plane of the horizon or a base line | Synonyms: perpendicular |
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| (adjective) upright in position or posture | Synonyms: erect, upright |
| (adjective) relating to or involving all stages of a business from production to distribution | - |
| (adjective) of or relating to different levels in a hierarchy (as levels of social class or income group) | - |
| (noun) a vertical structural member as a post or stake | Synonyms: upright |
| (noun) something that is oriented vertically | - |
| verticality | (noun) position at right angles to the horizon | Synonyms: erectness, uprightness, verticalness |
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| vertically | (adverb) in a vertical direction | - |
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| verticalness | (noun) position at right angles to the horizon | Synonyms: erectness, uprightness, verticality |
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| verticil | (noun) a whorl of leaves growing around a stem | - |
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| verticillate | (adjective) forming one or more whorls (especially a whorl of leaves around a stem) | Synonyms: verticillated, whorled |
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| verticillated | (adjective) forming one or more whorls (especially a whorl of leaves around a stem) | Synonyms: verticillate, whorled |
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| verticilliosis | (noun) wilt caused by fungi of the genus Verticillium | - |
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| verticillium | (noun) a fungus of the genus Verticillium | - |
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| vertiginous | (adjective) having or causing a whirling sensation; liable to falling | Synonyms: dizzy, giddy, woozy |
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| vertigo | (noun) a reeling sensation; a feeling that you are about to fall | Synonyms: dizziness, giddiness, lightheadedness |
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| vertu | (noun) artistic quality | Synonyms: virtu |
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| (noun) love of or taste for fine objects of art | Synonyms: connoisseurship, virtu |
| vespertilionid | (noun) a variety of carnivorous bat | Synonyms: vespertilian bat |
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| watertight | (adjective) without flaws or loopholes | Synonyms: bulletproof, ironclad, unassailable, unshakable |
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| (adjective) not allowing water to pass in or out | - |
| watertightness | (noun) The condition of being so tightly made that water cannot enter or escape. | Synonyms: waterproofness |
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| watertube | (noun) a boiler tube through which the water flows. | Synonyms: water tube |
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| wintertime | (noun) the coldest season of the year; in the Northern Hemisphere it extends from the winter solstice to the vernal equinox | Synonyms: winter |
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