Definition of foolish adjective from the Oxford Advanced American Dictionary

     

    foolish

     adjective
    adjective
    NAmE//ˈfulɪʃ//
     
     
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  1. 1(of actions or behavior) not showing good sense or judgment synonym silly, stupid She's just a vain, foolish woman. I was foolish enough to believe what Jeff told me. The accident was my fault—it would be foolish to pretend otherwise. How could she have been so foolish as to fall in love with him? a foolish idea/dream/mistake It was a very foolish thing to do.
  2. 2[not usually before noun] made to feel or look silly and embarrassed synonym silly, stupid I felt foolish. He's afraid of looking foolish in front of his friends.
 
adverb We foolishly thought that everyone would speak English. Foolishly, I allowed myself to be persuaded to enter the contest.
foolishness
 
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noun [uncountable] Jenny had to laugh at her own foolishness.
See the Oxford Advanced Learner's Dictionary entry: foolish