unburdened vs burdenless

unburdened and burdenless both are adjectives.

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

As adjectives, unburdened and burdenless are synonyms defined as:

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

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