untrusting vs mistrustful

untrusting and mistrustful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
untrusting	No	Yes	No	No
mistrustful	No	Yes	No	No

As adjectives, untrusting and mistrustful are synonyms defined as:

Other synonyms of untrusting include leery, suspicious, wary.

untrusting (adjective)	mistrustful (adjective)
openly distrustful and unwilling to confide	openly distrustful and unwilling to confide