goof
goof
verb
To make a foolish mistake, or to behave in a silly, unproductive way.
"Don't goof around during the lesson."
noun
A foolish or clumsy mistake, often made carelessly.
"He made a real goof on the pitch."
Thesaurus
Synonyms: fathead, goofball, goose, jackass, cuckoo, twat, zany, bozo, boob, sin, drop the ball, blunder