untense
/ˈʌntɛns/Definitions
1. verb
to cause (something) to become less tense or strained
“The exercise helped to untense my muscles after a long day.”
2. verb
to remove (tension) from something
“The doctor tried to untense the patient’s anxious muscles.”
3. adjective
not tense or strained
“The untense atmosphere of the park made it a perfect place for a picnic.”