| A | B |
| Ubiquitous | being or seeming to be everywhere at the same time; omnipresent |
| Unawares | by surprise; unexpectedly |
| Unassuming | not pretentious; modest |
| Uncouth | crude; unrefined; awkward |
| Unruly | difficult to govern; impossible to discipline |
| Unwitting | unaware, not knowing |
| Upshot | outcome; result |
| usurp | to seize the power or rights from another illegally |
| Usury | the lending of money at outrageously high interest; loan-sharking |
| Vacillate | to waver one side to the other; oscillate |
| Vacuity | emptiness ;vacuum |
| Vainglorious | vain; boastful |
| Valor | courage; bravery |
| Vehement | with ardor; energetically or violently forceful |
| Verbose | excessively wordy |
| Vex | to irritate or bother |
| Vexation | the act of vexing |
| Vilify | to slander; defame |
| Vindicate | to clear of blame or suspicion |