- (Of a person or action) lacking good sense or judgment; unwise: it was foolish of you to enter into correspondenceMore example sentences
stupid, silly, idiotic, witless, brainless, vacuous, mindless, unintelligent, thoughtless, half-baked, harebrained, imprudent, incautious, injudicious, unwise; ill-advised, ill-considered, impolitic, rash, reckless, foolhardy, daft• informal dumb, dim, dimwitted, halfwitted, thick, crack-brained, crackpot, pea-brained, wooden-headed, dumb-ass, chowderheaded
- The Government would be very unwise and foolish to attempt to get rid of her.
- She had been so foolish to think she could fall in love with another.
- How could I be so foolish to think this would go any differently?