mistrustful
adjective
[ mɪsˈtrʌstfʊl ]
• lacking in trust; suspicious.
• "he wondered if he had been unduly mistrustful of her"
Similar:
suspicious,
chary,
wary,
uncertain,
unsure,
distrustful,
untrusting,
doubtful,
dubious,
uneasy,
cautious,
hesitant,
sceptical,
unbelieving,
leery,