be all thumbs
blow
blunder
blunder away
blunder into
blunder on
blunder upon
bobble
boggle
bollix
bombinate
botch
bum
bungle
butcher
buzz
commit a gaffe
drone
faux pas
flounder
fumble
lumber
lurch
mar
miscue
mucker
muddle
muff
murder
play havoc with
screw up
slip
snapper
spoil
strum
stumble
thrum
trip
fail
go wrong
miscarry
mouth
speak
talk
utter
verbalise
verbalize
walk
bumbled
bumbles
bumbling
bumble-bee
jumble
bumptious
crutched
dodder
double-dyed
florinian
gawky
gullible
half-educated
hydrocephalic
moon-faced
moronic
musclebound
pig-headed
puffed-up
self-impressed
shortsighted
small-minded
spineless
tenement-house
unelected
untalented
well-meaning
wool-headed
Trumbull
crumble
grumble
humble
mumble
rumble
tumble
umbel
umble