bad job
balk
blunder
bobble
boggle
bonehead play
boner
boo-boo
botch
bungle
clumsy performance
error
etourderie
false move
false step
flub
fluff
foozle
fumble
gaucherie
hash
inadvertence
inadvertency
lapse
lapsus calami
lapsus linguae
loose thread
mess
miscue
misstep
mistake
muff
off day
omission
oversight
sad work
slip
slipup
stumble
trip
wrong step