Distrust

wiktionary

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dis- +‎  trust, alteration of the earlier term  wantrust. 

etymonline

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distrust (v.)

early 15c., "have a doubt or dread of" (a sense now obsolete); 1540s, "withhold trust or confidence from; doubt or suspect," from dis- + trust (v.) . "The etymologically correct form is mistrust, in which both elements are Teutonic" [Klein]. Related: Distrusted; distrusting.

distrust (n.)

"absence of trust; doubt or suspicion," 1510s, from dis- + trust (n.). "The etymologically correct form is mistrust, in which both elements are Teutonic" [Klein].