immorality has 3 distinct synonyms spread across 1 of its 2 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is morality.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the quality of not being in accord with standards of right or good conduct
“the immorality of basing the defense of the West on the threat of mutual assured destruction”
Synonyms, antonyms and the broader and narrower relations for immorality come from Princeton University’s WordNet. Full sources and licences.