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v. Present participle of unfix.

"Wolfson sums this up quite eloquently, linking this feature with Keats's musicality: The urn befriends its readers the way Keats's rhyme doesby encouraging our imaginative activity in a perpetual fixing and unfixing of what we think we know."

unfixed    unfixes    unfixing   

unsettle    dissolve    unfasten    loose    detach