53 synonyms for confident such as convinced, and collected, assured, and certain. Confident is an adjective, and its antonyms are insecure and uncertain.
And collected, assertive, assured, at ease, believing in oneself, calm, collected, composed, cool, cool-headed, equanimous, filled with aplomb, impassive, imperturbable, laid-back, level-headed, nonchalant, nonplussed, phlegmatic, poised, positive, relaxed, self-assertive, self-assured, self-confident, self-possessed, self-reliant, serene, sure of oneself, together, tranquil, unfazed, unflappable, unperturbed, and unruffled.
Assured, certain, convinced, easy in one's mind, have no doubt, hold the unwavering view, hopeful, in no doubt, not question, optimistic, persuaded, positive, sanguine, satisfied, secure in one's belief, sure, and unshakeable in one's belief.