Synonyms of the word 
UNSTRAINED → EFFORTLESS - RELAXED - UNFORCED
unstrained
- adj. Not strained or tense.
- adj. (not comparable) Not having been forced through a strainer.
effortless
- adj. Without effort.
relaxed
- adj. Having an easy-going mood or temperament.
- adj. Eased or loosened.
- adj. Free from tension or anxiety, at ease.
- v. simple past tense and past participle of relax.
unforced
- adj. Not forced.
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- 1word.ws/unstrained to play with words, suffixs, prefixs, etc.