smart as a whip

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

having or marked by unusual and impressive intelligence (Freq. 1)
- some men dislike brainy women
- a brilliant mind
- a brilliant solution to the problem
• Syn:
brainy, brilliant
• Similar to:
intelligent
• Derivationally related forms:
brilliancy (for: brilliant), brilliance (for: brilliant), brain (for: brainy)