Synonyms of 'brightness'
2 lightDictionary, shine, sparkle
An astronomer can determine the brightness of each star.
Cracks of light filtered through the shutters.
There was a sparkle about her, a shine of anticipation.
There was a sparkle in her eye that could not be hidden.
The dim bulb cast a soft radiance over his face.
3 intelligenceDictionary, intellect, brains (informal)
Her brightness seemed quite intimidating to me.
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the brilliance of the sun on the water
He congratulated himself on his cleverness.
Thesaurus for brightness from the Collins English Thesaurus
the condition of being bright