unworthiness has 1 distinct synonym 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 worthiness.
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 or state of lacking merit or value
the quality of being not particularly suitable or befitting
“he retracted nothing that he had said about the inappropriateness of either a corporeal God or a God who is a person”
Synonyms, antonyms and the broader and narrower relations for unworthiness come from Princeton University’s WordNet. Full sources and licences.