This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To release from mental tension, strain, or formality; relax.

v. To release (a bow, for example) from flexure or tension.

v. Nautical To untie or loosen (a rope or sail).

v. To straighten (something crooked or bent): unbend a paper clip.

verb-intransitive. To become less tense; relax.

verb-intransitive. To become less strict.

verb-intransitive. To become straight.

v. To free from flexure; to make, or allow to become, straight; to loosen; as, to unbend a bow.

v. A remit from a strain or from exertion; to set at ease for a time; to relax; as, to unbend the mind from study or care.

v. To unfasten, as sails, from the spars or stays to which they are attached for use.

v. To cast loose or untie, as a rope.

v. To cease to be bent; to become straight or relaxed.

v. To relax in exertion, attention, severity, or the like; hence, to indulge in mirth or amusement.

v. To free from flexure; to make, or allow to become, straight; to loosen.

v. A remit from a strain or from exertion; to set at ease for a time; to relax.

v.

v. To unfasten, as sails, from the spars or stays to which they are attached for use.

v. To cast loose or untie, as a rope.

verb-intransitive. To cease to be bent; to become straight or relaxed.

verb-intransitive. To relax in exertion, attention, severity, or the like; hence, to indulge in mirth or amusement.

To become relaxed or unbent.

To rid one's self of constraint; act with freedom; give up stiffness or austerity of manner; be affable.

To free from flexure; make straight: as, to unbend a bow.

To relax; remit from a strain or from exertion; set at ease for a time: as, to unbend the mind from study or care.

Nautical: To unfasten from the yards and stays, as sails.

To cast loose, as a cable from the anchor.

To untie, as a rope.

v. make less taut

v. become less tense, rest, or take one's ease

v. straighten up or out; make straight

v. free from flexure

v. unfasten, as a sail, from a spar or a stay

v. release from mental strain, tension, or formality

"They call me Goddess, Angel, and court me with dainties fit for queens 'tables and farfetched wines such as unbend the soul from cares."

unbending    unbends    unbent   

change posture    straighten out    straighten    unfasten    unwind    make relaxed    relax    loosen up    unlax    unstrain   

unbent   

relax   

End    Friend    Mende    Wend    abend    amend    append    apprehend    ascend    attend   

written    did    unbeaten    unwound    happened    unburden    corpse-like    unclosed    unfastening    five-round