burdenless vs unburdened

burdenless and unburdened both are adjectives.

Word	Noun	Adjective	Verb	Adverb
burdenless	No	Yes	No	No
unburdened	No	Yes	No	No

As adjectives, burdenless and unburdened are synonyms defined as:

burdenless and unburdened: not encumbered with a physical burden or load

burdenless (adjective)	unburdened (adjective)
not encumbered with a physical burden or load	not burdened with difficulties or responsibilities
	not encumbered with a physical burden or load