Entry 1 sense Webster, 1913 Mistrustful /mĭs-trŭs'-tfəl/ · Mis·trust·ful · IPA /mɪstrˈʌstfəl/ 01 a. Having or causing mistrust, suspicions, or forebodings. 1. Having or causing mistrust, suspicions, or forebodings. “Their light blown out in some mistrustful wood.” — Shak.