sure of oneself
Self-confident, as in Now that Mary's graduated she's much more sure of herself. This expression uses sure in the sense of “confident” or “secure,” a usage dating from the mid-1400s.
Words nearby sure of oneself
surd,
sure,
sure as shooting,
sure cure,
sure enough,
sure of oneself,
sure thing,
sure-enough,
sure-fire,
sure-footed,
sure-handed