Adjektive
stupid [ stupider/more stupid ; stupidest/most stupid]
idiotic [ more idiotic ; most idiotic ]
foolish [ more foolish ; most foolish ]
dopey [ more dopey ; most dopey ]
brainless [ more brainless ; most brainless ]
mindless [ more mindless ; most mindless]
dorky [ dorkier ; dorkiest ]
moronic [ more moronic ; most moronic]
Noun
moron [pl. morons] , {psych.}