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

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v. Third-person singular simple present indicative form of unfetter.

"May Ishtar, the goddess of fighting and war, who unfetters my weapons, my gracious protecting spirit, who loveth my dominion, curse his kingdom in her angry heart; in her great wrath, change his grace into evil, and shatter his weapons on the place of fighting and war."

unfettered    unfettering    unfetters   

unchain    unshackle    liberate    free