"goof" in the noun sense
1. fathead, goof, goofball, bozo, jackass, goose, cuckoo, twat, zany
a man who is a stupid incompetent fool
2. clown, buffoon, goof, goofball, merry andrew
a person who amuses others by ridiculous behavior
"goof" in the verb sense
1. drop the ball, sin, blunder, boob, goof
commit a faux pas or a fault or make a serious mistake
"I blundered during the job interview"
Source: WordNet® (An amazing lexical database of English)
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