fishy vs suspicious

fishy and suspicious both are adjectives.

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

As adjectives, fishy and suspicious are synonyms defined as:

Other synonyms of fishy include funny, shady, suspect.

fishy (adjective)	suspicious (adjective)
of or relating to or resembling fish	openly distrustful and unwilling to confide
not as expected	not as expected