unforced vs unstrained

unforced and unstrained both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unforced	No	Yes	No	No
unstrained	No	Yes	No	No

As adjectives, unforced and unstrained are synonyms defined as:

unforced (adjective)	unstrained (adjective)
not resulting from undue effort; not forced	not resulting from undue effort; not forced
not brought about by coercion or force	not placed under psychological stress