suspicious vs untrusting

suspicious and untrusting both are adjectives.

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

As adjectives, suspicious and untrusting are synonyms defined as:

Other synonyms of suspicious include leery, mistrustful, wary.

suspicious (adjective)	untrusting (adjective)
openly distrustful and unwilling to confide	openly distrustful and unwilling to confide
not as expected