- addlebrain
- addlehead
- addlepate
- airhead
- ament
- April fool
- automaton
- bananahead
- basket case
- beefhead
- beetlehead
- bimbo
- birdbrain
- blatherskite
- blockhead
- blubberhead
- blunderhead
- bonehead
- boob
- bozo
- brain
- bubblehead
- bufflehead
- buffoon
- butthead
- cabbagehead
- chawbacon
- chickenbrain
- chowderhead
- chucklehead
- chump
- clod
- clodhead
- clodpate
- clodpoll
- clot
- cluck
- conehead
- crackbrain
- cretin
- criticaster
- cuckoo
- deadhead
- dimwit
- ding-a-ling
- dingbat
- dingdong
- ditz
- dodo
- dodo brain
- dolt
- dolthead
- donkey
- doofus
- dope
- dork
- dullard
- dullhead
- dumb bunny
- dumb cluck
- dumbbell
- dumbhead
- dumbo
- dumdum
- dummkopf
- dummy
- dunce
- dunderhead
- dunderpate
- dupe
- easy mark
- egghead
- fathead
- fatwit
- featherbrain
- featherhead
- feeb
- flathead
- flibbertigibbet
- fool
- gaby
- gawk
- gudgeon
- half-wit
- hammerhead
- harebrain
- highbrow
- idiot
- ignoramus
- imbecile
- jackass
- jiggin
- jobbernowl
- jolterhead
- jughead
- klutz
- know-nothing
- knucklehead
- lackwit
- lamebrain
- lightweight
- loggerhead
- loon
- lowbrow
- lumpkin
- lunkhead
- meatball
- meathead
- mental midget
- mongoloid
- moron
- muddlehead
- mumpsimus
- musclehead
- mushhead
- muttonhead
- nincompoop
- ninny
- ninnyhammer
- nitwit
- no-brainer
- noddy
- noodlehead
- nudnik
- numskull
- patzer
- peabrain
- peahead
- pinbrain
- pinhead
- pointyhead
- potatohead
- puddinghead
- puttyhead
- rattlebrain
- rattlehead
- r*****
- rockhead
- sap
- saphead
- scatterbrain
- sciolist
- shit for brains
- silly fool
- simp
- simpleton
- slobbering idiot
- slowpoke
- softhead
- stupe
- submoronic twit
- sucker
- techie
- thickhead
- thickwit
- vegetable
- void
- witling
- woodenhead
- yoyo
- ziphead
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