Answer: stupid

AnswerCrossword Clue
STUPIDDimwitted
STUPIDWithout reason
STUPIDLike Boob McNutt
STUPIDBlockhead
STUPIDClueless
STUPID"Keep it simple, ..."
STUPIDMuscleheaded
STUPIDCry with a forehead slap, maybe
STUPIDCry exclaimed while facepalming
STUPIDHalf-witted
STUPIDDull.
STUPIDStatic-X "I'm With ..."
STUPIDLike Letterman's pet tricks
STUPIDDoltish
STUPIDClinton campaign slogan word
STUPIDMoronic
STUPIDOne-fourth of KISS
stupidlacking intelligence
stupida dull, foolish person / mentally slow
STUPIDOne Fruit Loop shy of a full bowl
STUPIDBy no means brilliant
STUPIDBoneheaded
STUPIDBonehead
STUPIDNot very bright
STUPID"Keep it simple, ...!"
STUPIDObtuse
STUPIDA few bricks shy of a load
STUPIDPart of KISS
STUPIDBy no means a rocket scientist
STUPIDThick
STUPID"Kiss Me, .."
STUPID".. Cupid" (Francis tune)
STUPIDPointless
STUPIDIll-advised
STUPIDNot at all sharp
STUPIDAsinine
STUPIDThickskulled.