icky vs stinking

icky and stinking both are adjectives.

Word	Noun	Adjective	Verb	Adverb
icky	No	Yes	No	No
stinking	No	Yes	No	No

As adjectives, icky and stinking are synonyms defined as:

Other synonyms of icky include crappy, lousy, rotten, shitty, stinky.

icky (adjective)	stinking (adjective)
soft and sticky	very bad
very bad	offensively malodorous