/ Dictionary / Index C cocksure: Meaning and Definition of Find definitions for: cock•sure Pronunciation: (kok'shoor', -shûr'), [key] — adj. perfectly sure or certain; completely confident in one's own mind: She was cocksure that she was able to do the job better than anyone else. too certain; overconfident: He was so cocksure he would win the election that he didn't even bother to campaign. perfectly secure or safe. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cocksure (Thesaurus) cocksucker cockswain Related Content Daily Word Quiz: jaundice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language