unstrained

(verb) cause to feel relaxed. Synonyms: relax, unstrain, unlax, loosen up, unwind, make relaxed. Example: "A hot bath always relaxes me."

(adj) not placed under psychological stress. Example: "The campaign would not leave party loyalties unstrained."

(adj) not resulting from undue effort; not forced. Synonyms: unforced. Examples: "A voice with a pleasingly unforced quality." "His playing is facile and unstrained."