Synonyms for Icky:

adj.

bad (adjective)
unpleasant.
dirty (adjective)
mucky.
fetid (adjective)
stinky.
not pleasant (adjective)
disgusting, offensive.
slovenly (adjective)
slovenly.
unclean (adjective)
grimy, septic, obscene, sordid, dusty, sloppy, scruffy, squalid, unsanitary, shabby, offensive, festering, disgusting, murky, defiled, putrid, dingy, toxic, mucky, foul, untidy, slovenly, grubby, unclean, dirty, impure, muddy, unhygenic, insalubrious, smutty, crummy, fetid, odious, scatological, filthy, infectious, grungy.
yucky (adjective)
yucky.

n.

inedible, stale, insipid, tasteless, bland, rancid. distasteful (noun)
cloying, sentimental.
icky (noun)
gooey, adhesive, stinky, stinking, bad, lousy, rotten.

Other synonyms:

displeasing, yucky. uncongenial, unpleasant. disagreeable, unsympathetic. stale.