Adjektive
stupid [ stupider/more stupid ; stupidest/most stupid ]
awkward [ awkwarder/more awkward ; awkwardest/most awkward ]
uncouth [ uncouther/more uncouth ; uncouthest/most uncouth]
silly [ sillier ; silliest]
clownish [ more clownish ; most clownish]
clunky [ clunkier ; clunkiest]
loopy [ loopier ; loopiest]
sheepish [ more sheepish ; most sheepish ]
oafish [ more oafish ; most oafish]
rustic [ more rustic ; most rustic]
ungraceful [ more ungraceful ; most ungraceful]
unhandy [ more unhandy/unhandier ; most unhandy/unhandiest]
Noun
klutz [pl. klutzes]
duffer [pl. duffers]
clodhopper [pl. clodhoppers]
numskull [pl. numskulls]
Adverb