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Definition of overconfident : Confident to excess.

Synonyms:

egocentric, snippety, uppish, madcap, patronizing, familiar, irrefutable, overbold, smart, insolent, uppity, boldfaced, reckless, nervy, brash, conceited, courtesy, sassy, superior, electropositive, presumptuous, attitude, self-opinionated, snippy, smart-alecky, confirming, positivistic, vain, forward, fresh, audacious, prescribed, flip, immodest, incontrovertible, assumptive, positivist, malapert, daredevil, presuming, convinced, brassy, saucy, contumelious, bold, cocksure, positive, positively charged, wise, brazen, pushy, pert, arrogant, temerarious, self-satisfied, proud, plus, impertinent, cheeky, assuming, confident

heedless, careless, rash, impudent

Usage examples:

• Now that it was all done, he feared that he had been overconfident, for could it really be possible that the greatest steel contract in years would come to him? - "Laughing Bill Hyde and Other Stories", Rex Beach.
• He has got good standing ground, but he knows how treacherous is the soil, and what pitfalls lie open to catch the rash, and reckless, and overconfident. - "The Religious Life of London", J. Ewing Ritchie.
• Hitherto, with one exception, I had figured before her as a successful man, and I positively shrank from appearing as one badly beaten and brought down by his own overconfident folly. - "The Mistress of Bonaventure", Harold Bindloss.