brightly vs bright

brightly is not an adjective while bright is an adjective.

Word	Noun	Adjective	Verb	Adverb
brightly	No	No	No	Yes
bright	No	Yes	No	Yes

As adverbs, brightly and bright are synonyms defined as:

Other synonyms of brightly include brilliantly.

brightly (adjective)	bright (adjective)
	emitting or reflecting light readily or in large amounts
	not made dim or less bright
	likely to turn out well in the future
	having strong or striking color
	splendid
	characterized by happiness or gladness
	characterized by quickness and ease in learning
	having lots of light either natural or artificial
	made smooth and bright by or as if by rubbing; reflecting a sheen or glow
	clear and sharp and ringing

brightly (adverb)	bright (adverb)
with brightness	with brightness