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underweight lower in weight than is normal, desired, or necessary.
underworld the criminal class of society. [2 definitions]
undo to release from or remove wrapping or fastening from. [3 definitions]
undress to remove the clothing or covering from. [2 definitions]
undue too much; more than is right or appropriate.
unearth to dig up out of the earth. [2 definitions]
uneasy not comfortable; nervous. [2 definitions]
unemployed having no job; not employed. [2 definitions]
unequal not equal, as two or more people, things, or numbers. [2 definitions]
uneven not smooth, regular, or flat; rough or jagged. [5 definitions]
unfair against what is just or fair. [2 definitions]
unfamiliar not known or experienced before; unusual; strange. [2 definitions]
unfasten to release from; undo; separate.
unfold to open or spread out from a folded condition. [4 definitions]
unfortunate having bad luck; unlucky. [3 definitions]
unfriendly not friendly; distant, unpleasant, or mean to other people. [2 definitions]
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.