From WordNet (r) 3.0 (2006):
goof
n 1: a man who is a stupid incompetent fool [syn: fathead,
goof, goofball, bozo, jackass, goose, cuckoo,
twat, zany]
2: a person who amuses others by ridiculous behavior [syn:
clown, buffoon, goof, goofball, merry andrew]
v 1: commit a faux pas or a fault or make a serious mistake; "I
blundered during the job interview" [syn: drop the ball,
sin, blunder, boob, goof]