"distrustful" in the adjective sense
1. distrustful
having or showing distrust
"a man of distrustful nature"
"my experience...in other fields of law has made me distrustful of rules of thumb generally"- B.N.Cardozo
"vigilant and distrustful superintendence"- Thomas Jefferson
Source: WordNet® (An amazing lexical database of English)
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