overconfident

adj

1. cocksure, dead certain, too certain; arrogant, brazen, audacious, impertinent; swaggering, blustering, Inf. pushy; bumptious, self-assertive, self-assured, self-assuming; imperious, overbearing, egotistic; lofty, Inf. toplofty, condescending, vainglorious, conceited, high-and-mighty, pompous, self-important, riding for a fall.

2. brash, hasty, precipitate, pell-mell; impetuous, impulsive, unrestrained, ungoverned, head-over-heels; reckless, risky, incautious, careless, unwary.

3. foolhardy, harebrained, thoughtless, regardless, careless; shortsighted, daring, spontaneous, unpremeditated; injudicious, unwise; ill-considered, ill-advised, impolitic, indiscreet.