What is the meaning of unstrained?

verb

• Cause to feel relaxed.
  • usage: "A hot bath always relaxes me"
  • synonyms: relax, unstrain, unlax, loosen up, unwind, make relaxed

adjective

• Not placed under psychological stress.
  • usage: "the campaign would not leave party loyalties unstrained"
• Not resulting from undue effort; not forced.
  • usage: "a voice with a pleasingly unforced quality"; "his playing is facile and unstrained"
  • synonyms: unforced