Answer:

DOLT

AnswerCrossword Clue
DOLTNincompoop
DOLTFool
DOLTBoob
DOLTOaf
DOLTDumbbell
DOLTBlithering idiot
DOLTDimwit
DOLTDim-bulbed sort
DOLTKnucklehead
DOLTLamebrain
DOLTDunce-cap candidate
DOLTBlockhead
DOLTBubblehead
DOLTClodpoll
DOLTBirdbrain
DOLTHardly a Mensa candidate
DOLTLummox
DOLTNo rocket scientist
DOLTDoofus
DOLTBuffoon
DOLTIdiot
DOLTNitwit
DOLTBonehead
DOLTDimbulb
DOLTAirhead
DOLTDunderhead
DOLTChowderhead
DOLTLunkhead
DOLTSimpleton
DOLTClod
DOLTNimrod
DOLTNinny
DOLTNumskull
DOLTDullard
DOLTChucklehead
DOLTCluck
DOLTDull-witted one
DOLTFeatherbrain
DOLTMuttonhead
DOLTNoodlehead