inventive 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
(used of persons or artifacts) marked by independence and creativity in thought or action
“an imaginative use of material”
Synonyms, antonyms and the broader and narrower relations for inventive come from Princeton University’s WordNet. Full sources and licences.