mistrustful vs untrusting

mistrustful and untrusting both are adjectives.

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

As adjectives, mistrustful and untrusting are synonyms defined as:

Other synonyms of mistrustful include leery, suspicious, wary.

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