ultimate adj. being last in a series, process, or progression; fundamental; elemental; eventual¹

ultimately adv. in the end; eventually

unanimous adj. sharing the same opinions or views; being in complete harmony or accord; based on or characterized by complete assent² or agreement

unauthorized adj. unlicensed; forbidden; unlawful

unbiased adj. impartial⁴; equitable⁵

uncertainty⁶ n. doubtfulness

unconventional adj. not standard; not ordinary

undercut v. to offer at lower prices than the competition; to cut off the under part; to slice the ball from underneath⁷ (Golf, Tennis); to weaken; to undermine

underestimate v. to assign too low a value to

underlie⁸ v. to be located under or below; to be the support or basis of; account for; to constitute a prior financial claim over

underline n. caption⁹ beneath an illustration

underline v. to emphasize

undermine v.to weaken by wearing away a base or foundation; to weaken, injure, or impair¹⁰, often by degrees or imperceptibly; sap;

understatement n. representing something less strongly than what the facts would justify¹¹; statement expressing something in a restrained manner

underway adj. having begun a journey (especially of a sea vessel); initiated¹²; in progress; under construction

unfair adj. biased³; dishonest

unforeseen adj. not anticipated; not expected

unfortunately adv. regrettably

uniform adj. always the same, as in character or degree; unvarying; conforming to one principle, standard, or rule; consistent; being the same as or consonant¹³ with another or others

uniform n. a distinctive¹⁴ outfit¹⁵ intended to identify those who wear it as members of a specific group

unify¹⁶ v. to join; to cause to become one

union n. workers' association; federation¹⁷; amalgamation¹⁸; marriage; reproductive coupling; device which fits two pieces together

unique adj. singular; matchless; rare

uniqueness n. singularity; individuality; incomparability

unit n. specific quantity regarded as a standard; combination which acts a whole; piece; furniture; device; apparatus¹⁹

unlessconj. not before; precluding²⁰; barring; except; aside from

unlimited²¹ adj. infinite; boundless²²

unlock v. to open; to free from restraints; to release

unnecessary adj. excessive; redundant²³; superfluous²⁴

unsanitary adj. not healthful; not clean

unsatisfactory adj. inadequate²⁵; disappointing; not good enough

unveil v. to reveal; to uncover; to disclose

upcoming adj. about to happen; imminent²⁶

upgrade n. update; installation of a newer version of a program or the replacing of a system component²⁷ with a newer component (Computers); hill; acclivity

upgrade v. to improve; to raise the quality of; to exchange something for another of better quality

upholstery n. materials that are used to cushion and cover furniture (i.e. fabric²⁸, lining²⁹, padding, etc.); process of cushioning and covering furniture

upwards³⁰ adv. to a higher level; more than; higher than

urban adj. pertaining³¹ to or characteristic of a city; living in a city; municipal

urbanize v. to change from rural to urban; to make into a city; to impart urban characteristics

urge v. to force or drive forward or onward³²; impel³³; to entreat³⁴ earnestly and often repeatedly; exhort³⁵; to advocate earnestly the doing, consideration, or approval of; press for; to move or impel to action, effort, or speed; spur

urgent adj. pressing; compelling; immediate³⁶; prompt

utilization³⁷ n. employment; use of; putting to practical use

utilize³⁸ v. to put to practical use; to take advantage of

utmost adj. being or situated³⁹ at the most distant limit or point; farthest; of the highest or greatest degree, amount, or intensity⁴⁰; most extreme

utmost n. the greatest possible amount, degree, or extent; the maximum