unstrained vs effortless

unstrained and effortless both are adjectives.

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

unstrained (adjective)	effortless (adjective)
not resulting from undue effort; not forced	requiring or apparently requiring no effort
not placed under psychological stress	not showing effort or strain