lighthearted vs blithe

lighthearted and blithe both are adjectives.

Word	Noun	Adjective	Verb	Adverb
lighthearted	No	Yes	No	No
blithe	No	Yes	No	No

As adjectives, lighthearted and blithe are synonyms defined as:

Other synonyms of lighthearted include blithesome, light-hearted, lightsome.

lighthearted (adjective)	blithe (adjective)
carefree and happy and lighthearted	carefree and happy and lighthearted
	lacking or showing a lack of due concern