Cocksure /(?)/

Cock·sure

Cocksure

a.
  1. Perfectly safe. [Obs.]
    We steal as in a castle, cocksure: . . . we walk invisible.
  2. Quite certain. [Colloq.]
    I thought myself cocksure of the horse which he readily promised me.
  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.]