rotten vs icky

rotten and icky both are adjectives.

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

As adjectives, rotten and icky are synonyms defined as:

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

rotten (adjective)	icky (adjective)
having decayed or disintegrated; usually implies foulness	soft and sticky
damaged by decay; hence unsound and useless	very bad
very bad