Answer: dullards

AnswerCrossword Clue
DULLARDSDunderheads.
DULLARDSSimpletons.
DULLARDSBlockheads
DULLARDSIntellectuals' opposites
DULLARDSNumbskulls
DULLARDSThey're not very bright
DULLARDSNitwits
dullardsA slow or stupid person
dullardsDULLARD, a dolt (a stupid person)