| Term | Definition |
| Tenet | a shared idea or belief of a group |
| Tenuous | thin, slender; rare; insignificant; flimsy |
| Terrestrial | having to do with earth |
| Thespian | pertaining to acting on a stage |
| Thwart | to frustrate, impede; to get in the way of |
| Titanic | enormous |
| Titillate | to excite pleasurably; to tease |
| Titular | in title or name only |
| Tome | a large book |
| Torpor | a state of being inactive, laziness, inaction |
| Torrid | hot in weather or emotions; passionate |
| Torso | a human trunk, upper body |
| Tractable | easily controlled, obedient |
| Transgress | to break the law; to sin |
| Travail | toil, very hard work, difficulties in life |
| Trenchant | keen, incisive, forceful |
| Truculent | bellicose, savage, barbaric |
| Tutelage | guardianship |
| Tyrannicide | the killing of a tyrant, a cruel ruler |
| Ubiquitous | omnipresent; existing, or seeming to exist, everywhere at once |
| Umbrage | an offense |
| Unanimous | in complete agreement |
| Unassuming | modest |
| Unbridled | unrestrained, uncontrolled, wild |
| Unctuous | overly suave or oily in speech or manner |
| Unethical | having bad morals, lack of ethics |
| Unguent | an ointment, salve for healing |
| Unheralded | unnoticed, unannounced |
| Unilateral | one-sided |
| Unseemly | not proper or decent; unattractive |
| Unsound | not well-formed or built, unsafe |
| Unwieldy | hard to handle because of size or weight; unmanageable; bulky; cumbersome |
| Unwitting | unaware |
| Urbane | very sophisticated, cosmopolitan, of the city |
| Usurp | to seize illegally |
| Usury | the act of loan sharking (charging too much interest on a loan) |
| Utopia | the perfect society |
| Vacillation | a change or wavering in opinion |
| Validate | to confirm, verify |
| Vanguard | leading persons or position |
| Vapid | lifeless, flat, uninteresting, stupid |
| Vendetta | a feud or nemesis; revenge |
| Venerable | worthy of respect because of advanced age, achievement, virtue, or historical importance |
| Venerate | to revere or worship |
| Veracity | truthfulness, honesty |
| Vertigo | dizziness |
| Vestige | a trace of something that no longer exists; something remaining |
| Viable | workable |
| Vie | to contend, compete |
| Vignette | a brief description, word picture |
| Vilify | to use abusive or slanderous language |
| Vindicate | to clear the name, prove innocent |
| Virtuoso | a person with great artistic skill |
| Visceral | deeply felt; deep-seated; profound |
| Viscous | thick and sticky |
| Vituperate | to scold or berate with abuse |
| Vituperative | abusive in speech; excessively scolding |
| Viviparous | bearing live young (instead of by laying eggs) |
| Vociferous | producing a loud outcry; talkative |
| Voluminous | large |
| Waive | to pardon |
| Wallow | to engage in mentally; to roll around in |
| Wan | sickly pale; faint feeble, or weak in a way suggestive a sickly condition, great weariness, or sadness |
| Wane | to decrease in power or size; dwindle; decline; sink; ebb |
| Wanton | immoral |
| Wary | cautious |
| Watershed | a crucial dividing point |
| Wharf | a structure built over water |
| Winsome | full of a winning quality; fetching, luring |
| Wrest | to grab away with force |
| Wry | twisted with sarcasm |
| Xenophobia | fear of strangers |