reflect has 13 distinct synonyms spread across 3 of its 7 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
manifest or bring back
“This action reflects his true beliefs”
reflect deeply on a subject
“I mulled over the events of the afternoon”
to throw or bend back (from a surface)
“Sound is reflected well in this auditorium”
show an image of
“her sunglasses reflected his image”
give evidence of a certain behavior
“His lack of interest in the project reflects badly on him”
Synonyms, antonyms and the broader and narrower relations for reflect come from Princeton University’s WordNet. Full sources and licences.