overconfident

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

marked by excessive confidence (Freq. 1)
- an arrogant and cocksure materialist
- so overconfident and impudent as to speak to the queen
- the less he knows the more positive he gets
• Syn:
cocksure, positive
• Similar to:
confident
• Derivationally related forms:
positiveness (for: positive), overconfidence, cocksureness (for: cocksure)