distrustful
incredulous
Humean
Pyrrhonic
agnostic
ambiguous
capricious
cautious
chancy
changeable
cynical
dicey
disbelieving
disinclined to believe
disposed to doubt
dissenting
doubtful
doubting
dubious
equivocal
erratic
fickle
freethinking
from Missouri
guarded
hard of belief
hesitant
hesitating
impervious to persuasion
in doubt
incalculable
inconvincible
indecisive
indemonstrable
irresolute
leery
mistrustful
mistrusting
polysemous
pyrrhonian
pyrrhonic
questioning
scrupulous
shy
shy of belief
skeptic
suspecting
suspicious
appreciative
bemused
contemptuous
derisive
disapprove
disdainful
dissatisfied
exasperate
inquisitive
perplex
quizzical
reluctant
sceptical
speculative
sympathetic
wary
receptacle
believing