dramatic has 2 distinct synonyms spread across 1 of its 4 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 2 recorded opposites are undramatic, lyric.
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.
suitable to or characteristic of drama
“a dramatic entrance in a swirling cape”
used of a singer or singing voice that is marked by power and expressiveness and a histrionic or theatrical style
“a dramatic tenor”
1 of the 4 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 dramatic.
Synonyms, antonyms and the broader and narrower relations for dramatic come from Princeton University’s WordNet. Full sources and licences.