reflective has 8 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 nonreflective.
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.
deeply or seriously thoughtful
“Byron lives on not only in his poetry, but also in his creation of the `Byronic hero' - the persona of a brooding melancholy young man”
capable of physically reflecting light or sound
“a reflective surface”
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 reflective.
Synonyms, antonyms and the broader and narrower relations for reflective come from Princeton University’s WordNet. Full sources and licences.