Mistrustful

(a.) Having or causing mistrust, suspicions, or forebodings.

Thesaurus Entries

Pyrrhonic, agnostic, cagey, chary, distrustful, doubtful, doubting, dubious, from Missouri, in doubt, leery, mistrusting, questioning, scrupulous, shy, skeptical, suspecting, suspicious, uncertain, untrusting, wary