/ Dictionary / Index U uncool: Meaning and Definition of Find definitions for: un•cool Pronunciation: (un-kl'), [key] — adj. Slang. not self-assured or relaxed: He felt very uncool, making a speech to strangers. not sophisticated or worldly-wise. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: uncool (Thesaurus) unconventional warfare uncork Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language