U

Ubiquitarianism belief that Christ is everywhere
Ubiquitous Seeming to be seen everywhere
Ufology study of alien spacecraft
Ultimatum Final demand or set of terms.
Ultrasonic Means frequency is excess of about 20,000 cycles per second.
Unalist priest holding one benefice
Unalterable/Irrevocable Incapable of being altered
or
That cannot be altered
Unanimous All of one mind.orThat which is accepted by one and all.
Unanimous Agreed to by everyone
Unanimous All of one mind.
Unavoidable/Inevitable Incapable of being avoided.
or
That cannot be avoided.
Undermine Making (someone or something) weaker or less effective usually in a secret or gradual way
Underneath Below or beneath (something)
Understate Saying that (something) is smaller, less important, etc., than it really is
Understatement Less strong expression than the facts would bear out.
or
A statement that makes something seem smaller, less important, etc., than it really is
Undulating Going up and down alternatively.
Unequivocal Having only one meaning.
Unfathomable So deep that the bottom cannot be reached.
Uniform Not varying in form, quality, etc.
Unilateral Done by one side or by one party.
or
Involving only one group or country
Unimpeachable That which cannot be doubted or questioned.
Unintelligible That which cannot be understood.
or
Incapable of being understood
Unique Only one of its kind.
or
Having no like or equal.
Universal Of or for all
or
Belonging to all.
Univorous living on only one host or source of food
Unprecedented That which did not happen before.
Unreasonable Not governed by reason.
Unrequited That which is not returned or rewarded.
Unscrupulous/Unconscionable Not guided by conscience.
Unsociable Averse to mining in society.
Unsolvable That cannot be solved.
or
Incapable of being solved
Unsophiscated That which is not artificial.
Untenable That which cannot be maintained.
Untoward Bad or unfavorable; not good
Unwarranted Not necessary or appropriate
Unwieldy Difficult to handle, control, or deal with because of being large, heavy, or complex
Upend Cause (someone) to fall down or be turned over
Upfront Not keeping anything secret or hidden : honest and direct
Upgrade Fix in a high grade.
Upheaval Major changes or a period of change that causes a lot of conflict, confusion, anger, etc.
Upkeep Care or maintenance of buildings, equipment, etc.
Uprising Usually a violent effort by many people to change the government or leader of a country
Uproar Situations in which many people are upset, angry, or disturbed by something
Upstart/Parvenue One who has suddenly risen to wealth and power
or
One who has suddenly gained new wealth power or prestige.
Upsurge Sudden and serious increase in something.
Uranology study of the heavens; astronomy
Uranomancy divination by studying the heavens
Uranomania obsession with the idea of divinity
Uranophobia fear of heaven
Urbanology study of cities
Urbicide Destruction of a city
Urchin Poor and dirty children who annoy people or cause minor trouble
Urenology study of rust molds
Urimancy divination by observing urine
Urinary Connected with urine or the parts of the body through which it passes
Urology study of urine; urinary tract
Ursicide Killing or killer of a bear
Ursine Of or about bears.
Usher One who shows people to their seats in theatres, cinemas, etc.
Usurer One who lends money at exorbitant rates of interest.
or
One who is very careful in the use of money.
Usury The leading of money with an excessive charge for its use.
Utilitarian Made to be useful rather than to be decorative or comfortable
Utopia Imaginary places in which the government, laws, and social conditions are perfect
or
Ideal or perfect society : utopias are imagined communities where everyone lives in perfect peace and harmony
Utricide One who stabs an inflated skin vessel instead of killing someone
Uxoricide Killing/killer of one’s wife.
Uxorious Foolishly fond of one’s wife.
Uxorious/Henpecked Foolishly fond of one’s wife.