stinking vs icky

stinking and icky both are adjectives.

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

As adjectives, stinking and icky are synonyms defined as:

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

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