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improper has 3 distinct synonyms spread across 2 of its 3 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 proper.
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.
not suitable or right or appropriate
“slightly improper to dine alone with a married man”
not conforming to legality, moral law, or social convention
“an unconventional marriage”
Synonyms, antonyms and the broader and narrower relations for improper come from Princeton University’s WordNet. Full sources and licences.