true has 15 distinct synonyms spread across 9 of its 15 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 false.
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.
consistent with fact or reality; not false
“the story is true”
proper alignment; the property possessed by something that is in correct or proper alignment
“out of true”
4 of the 15 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for true.
Synonyms, antonyms and the broader and narrower relations for true come from Princeton University’s WordNet. Full sources and licences.