sure of oneself

1. 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.

Related Words

• confident 
• easygoing 
• levelheaded 
• poised 
• relaxed 
• self-assured 
• serene 
• tranquil 
• unflappable 
• unruffled