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unhappy not glad or cheerful; sad; full of gloom. [2 definitions]
unhealthy in bad health; ill. [2 definitions]
unheard-of never before known or considered; completely new.
uni- a prefix that means "one" or "single."
unicorn a mythical animal having the body of a horse and a single, long horn extending from its forehead.
uniform always the same; never changing. [3 definitions]
uniform resource locator an address identifying the location of a file on the Internet, commonly called a URL. A URL consists of the computer on which the file is located and the file's location on that computer.
unify to make into a single unit or thing; bring together; unite.
unimportant not powerful or respected. [2 definitions]
uninhabited not lived in or inhabited.
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.