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Definition of distrustful : 1. Apt to distrust; suspicious; mistrustful.
2. Not confident; diffident; wanting confidence or thrust; modest; as, distrustful of ourselves, of one's powers.

Synonyms:

overjealous, skeptical, disbelieving, suspicious, misanthropical, suspicion, unsure, undecided, negativistic, doubting, oversuspicious, cynical, leery, misanthropic, doubt, disbelieve, incredulous, unbelieving, trust, take something with a grain/pinch of salt, unsettled, dubious, mistrust, hinky, suspecting, show-me, distrust, misogynic, wary, unconvinced, uncertain, sceptical, trustless, untrusting

jealous, green-eyed, questioning, mistrustful

Usage examples:

• But the Boers were also very distrustful of the English Government, believing it to aim at nothing less than the annexation of their country. - "Impressions of South Africa", James Bryce.
• Knowing Bonaparte's distrustful disposition, I thought he must have suspected that Jerome had employed threats, or at any rate, that he had used some illegal influence to facilitate the success of his loan. - "The Project Gutenberg Memoirs of Napoleon Bonaparte", Bourrienne, Constant, and Stewarton.
• It was natural that one so distrustful of cabinet machinery in a colony should altogether fail to see the place of party. - "British Supremacy & Canadian Self-Government 1839-1854", J. L. Morison.