untrusting vs suspicious

untrusting and suspicious both are adjectives.

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

As adjectives, untrusting and suspicious are synonyms defined as:

Other synonyms of untrusting include leery, mistrustful, wary.

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