Synonyms for Suspicion:

n.

scepticism, doubt yourself, reserve, a question mark over something. distrustful, take something with a grain/pinch of salt, disbelieve, suspicious. doubt (noun)
hunch, surmise, misgiving, mistrust, distrust.
expectance (noun)
deduction, Envisagement, assumption, readiness, presupposition, presumption, apprehension, anticipation, foreknowledge, preparedness, Expectance.
misgiving (noun)
surmise.
mistrust (noun)
mistrust.
suspicion (noun)
misgiving, hunch, distrust, intuition, suspiciousness, mistrust.
uncertainty (noun)
misgiving.

Other synonyms:

disbelieve, distrustful. suspicious.