Full of brightness; shining brightly; having a pleasant and cheerful quality of light.
From 'bright' (Old English 'beorht', Germanic origin) plus the suffix '-some' (Old English 'sum', meaning 'having the nature of'). This archaic/dialectal form emphasizes the abundance of brightness.
This is a wonderfully archaic word that sounds like it should be in a medieval poem—'brightsome' has more warmth and personality than just 'bright,' almost suggesting that brightness is a personality trait!
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