Pyrrhonism
apprehension
apprehensiveness
awake a doubt
be diffident
be doubtful
be dubious
be possessive
be skeptical
be uncertain
beware
cageyness
call in question
challenge
chariness
contest
diffidence
dispute
distrust
distrustfulness
doubt
doubtfulness
dubiety
dubiousness
forebode
greet with skepticism
guess
half believe
half-belief
harbor suspicions
have reservations
leeriness
misdoubt
misgive
misgiving
mistrustfulness
query
question
raise a question
reservation
scepticism
scruple
scrupulousness
self-doubt
shadow of doubt
skepticalness
skepticism
smell a rat
surmise
incertitude
uncertainty
mistrusted
mistrusting
mistrusts
antagonism
disaffection
disapproval
disbelief
discontent
discouragement
disdain
dissension
enmity
insecurity
reluctance
repugnance
repulsion
resentment
uneasiness
wariness
adjust
antitrust
brust
bused
bussed
bust
combust
crust
cussed
discussed
disgust
dust
encrust
entrust
fussed
fust
gust
hust
incrust
just
lust
must
nonplussed
readjust
robust
rust
thrust
trust
unjust