Synonyms for Slimy (same or very similar meaning)
WordNet sense 1 (covered with or resembling slime):
slimedWordNet sense 2 (causing or tending to cause things to slip or slide):
slippery, slippyWordNet sense 3 (morally reprehensible):
despicable, ugly, unworthy, vile, worthless, wretchedWordNet sense 4 (morally bad or wrong):
evilFrom the ODE community, based on WordNetadd/edit