Filed from 3 published puzzles

IMBECILE

Set to 3 different clues across 3 published puzzles, most often "You fool!" — The New York Times, Friday, 16 March 2001.

8 letters

Every clue on record, most used first

"You fool!"once
The New York Times — Friday, 16 March 2001
Doltonce
The New York Times — Tuesday, 5 December 2000
One who doesn't know muchonce
The New York Times — Thursday, 2 October 1997

Other answers to these clues

ASS3 letters
BOZO4 letters
CLOD4 letters
FATHEAD7 letters
IDIOT5 letters
LOUT4 letters
LUNK4 letters
OAF3 letters
PINHEAD7 letters
SCHMO5 letters
SCHNOOK7 letters