intransitivity has 1 distinct synonym spread across 1 of its 1 sense. 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 transitivity.
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 grammatical relation created by an intransitive verb
Synonyms, antonyms and the broader and narrower relations for intransitivity come from Princeton University’s WordNet. Full sources and licences.