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unbecoming	not attractive or proper on a particular person. [2 definitions]
unbelievable	astounding or very hard to believe.
uncanny	beyond ordinary human or natural means or ability.
uncertain	not known for sure; not definite. [3 definitions]
uncle	the brother or brother-in-law of one's father or mother. [2 definitions]
unclear	hard to understand; confusing. [2 definitions]
Uncle Sam	a cartoon person that represents the government or people of the United States. Uncle Sam is a tall, thin man with a beard, top hat, and trousers that have red and white stripes. [2 definitions]
uncomfortable	feeling discomfort; not comfortable. [2 definitions]
uncommon	unusual or rare.
unconscious	not conscious or aware. [3 definitions]
unconstitutional	not according to the constitution of a state or country.
uncooperative	not willing to work together or cooperate.
uncover	to remove the cover from. [2 definitions]
undaunted	not discouraged; not giving up even though something is difficult or frightening.
undecided	not yet decided or settled. [2 definitions]
under	below; beneath. [15 definitions]
under-	a prefix that means "below" or "beneath." [2 definitions]
underclothes	clothing worn next to the skin under other clothing; underwear.
under cover	hidden; in secret.
underdog	a person or team that is expected to lose a contest in sports or politics.
undergo	to have the experience of; receive; endure.

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