suspicious vs shady

suspicious and shady both are adjectives.

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

As adjectives, suspicious and shady are synonyms defined as:

Other synonyms of suspicious include fishy, funny, suspect.

suspicious (adjective)	shady (adjective)
openly distrustful and unwilling to confide	quiet, dark, or concealed
not as expected	of questionable honesty or legality
	not as expected
	filled with shade