GNU Collaborative International Dictionary of English

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Found one definition

1.       
   goofy adj.  foolish and silly, or appearing silly; as, “he wore a goofy hat”.
   
   Syn. -- cockamamie, cockamamy, fool(prenominal), sappy, silly, wacky, zany, unreasonable.
   
   [WordNet 1.5 +PJC]