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.
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confident, overconfident, cocky, courageous, assured, self-assured, fearless, self-reliant, poised, levelheaded, serene, easygoing, relaxed, unruffled, unflappable, tranquil, possessed, sedate, cool, soothed
- sure as shooting,
- sure cure,
- sure enough,
- sure thing,
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.