appropriate has 7 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 inappropriate.
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.
take possession of by force, as after an invasion
“the invaders seized the land and property of the inhabitants”
Synonyms, antonyms and the broader and narrower relations for appropriate come from Princeton University’s WordNet. Full sources and licences.
suitable for a particular person or place or condition etc
“a book not appropriate for children”