1. A person who amuses others by ridiculous behavior
   "The goofball entertained children at the fair with his silly antics";
   - clown, buffoon, goof [informal], merry andrew [archaic], droll [archaic]
    
2. Someone who is a stupid incompetent fool
   "Don't be such a goofball; think before you act";
   - fathead [informal], goof [informal], bozo [N. Amer, informal], jackass [informal], goose [informal], cuckoo [informal], zany [informal]

Derived forms: goofballs

Type of: boofhead [Austral, informal], charlie [Brit, informal], comedian, comic, diddy [Brit, informal], dill [Austral, NZ, informal], drongo [Austral, NZ, informal], fool, funnyman, galah [Austral, informal], juggins [Brit, informal], jughead [N. Amer, informal], mampara [S.Africa, informal], meathead [informal], moegoe [S.Africa, informal], muggins [Brit, informal], nit [Brit, informal], sap [N. Amer, informal], tomfool

Encyclopedia: Goofball