different between unturn vs untorn

English

un- +? turn

unturn (third-person singular simple present unturns, present participle unturning, simple past and past participle unturned)

To turn in a reverse way, especially so as to open something.
- 1817, John Keats, Sonnet written on the day that Mr. Leigh Hunt left Prison
  Think you he nought but prison walls did see,
  Till, so unwilling, thou unturn'dst the key ?

From Middle English untorn, untorne, equivalent to un- +? torn.

untorn (not comparable)

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