light-hearted vs blithe

light-hearted and blithe both are adjectives.

Word	Noun	Adjective	Verb	Adverb
light-hearted	No	Yes	No	No
blithe	No	Yes	No	No

As adjectives, light-hearted and blithe are synonyms defined as:

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

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