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brightness has 7 distinct synonyms spread across 2 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 dullness.
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.
intelligence as manifested in being quick and witty
the quality of being luminous; emitting or reflecting light
“its luminosity is measured relative to that of our sun”
Synonyms, antonyms and the broader and narrower relations for brightness come from Princeton University’s WordNet. Full sources and licences.