D defs.my
Entry 3 senses Webster, 1913

Cocksure

· Cock·sure · IPA
01 a. Perfectly safe.
  1. 1.
    Perfectly safe.[Obs.]
    “We steal as in a castle, cocksure: . . . we walk invisible.” Shak.
  2. 2.
    Quite certain.[Colloq.]
    “I thought myself cocksure of the horse which he readily promised me.” Pope.
  3. 3.
    overconfident; -- of people; as, the team was so cocksure of winning that they didn't practice in the week before the big game..[Colloq.]