theatrical has 3 distinct synonyms spread across 1 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 untheatrical.
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.
suited to or characteristic of the stage or theater
“a theatrical pose”
a performance of a play
1 of the 3 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for theatrical.
Synonyms, antonyms and the broader and narrower relations for theatrical come from Princeton University’s WordNet. Full sources and licences.