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uninterested having no interest; indifferent.
union the act of uniting. [6 definitions]
unique being the only one of its type; sole; single. [2 definitions]
unison (used with "in") speaking all at the same time, or singing at the same time in the same pitch. [2 definitions]
unit a single thing that is one of a group of similar things. [4 definitions]
unite to join together into a whole; combine. [3 definitions]
United Arab Emirates a Middle Eastern country on the coast of the Persian Gulf, bordering Saudi Arabia and Oman. The capital of the United Arab Emirates is Abu Dhabi.
United Kingdom a nation in northwestern Europe on the islands of Great Britain and Ireland and made up of England, Scotland, Wales, and Northern Ireland (usually used with "the"). London is the capital of the United Kingdom.
United Nations (used with a singular or plural verb) an organization of many nations started in 1945 to promote world peace and understanding.
United States a North American country extending from the Atlantic to the Pacific between Canada and Mexico and including Alaska and Hawaii, also known as "United States of America" (usu. prec. by, "the").
United States of America a country in North America (usually used with "the"). Washington, D.C., is the capital of the United States of America.
unity the condition of being united or of acting as one.
universal of, having to do with, or characteristic of the whole world or the world's population. [2 definitions]
universe all matter and energy; all existing things, including the earth and heavens.
university a large school, where people both learn and do research. A student must finish high school before attending a university. Universities offer several levels of degrees.
unkind not kind or sympathetic; harsh.
unknown not known; not familiar.
unlawful not allowed by law; illegal.
unless except on the condition that.
unlike not alike or equal; different; unequal. [3 definitions]
unlimited having no limits, bounds, or restrictions.