perplexed
addled
at a loss
at a nonplus
at a stand
at a standstill
at an impasse
baffled
bamboozled
beat
bewildered
buffaloed
confounded
dazed
floored
fuddled
in a dilemma
in suspense
licked
muddled
mystified
on tenterhooks
puzzled
stuck
stumped
thrown
vexed
adjust
antitrust
brust
bused
bussed
bust
combust
crust
cussed
discussed
disgust
distrust
dust
encrust
entrust
fussed
fust
gust
hust
incrust
just
lust
mistrust
must
readjust
robust
rust
thrust
trust
unjust