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Webster 1913 Edition

Verb.

[1st pref.

un-

tune

To make incapable of harmony, or of harmonious action; to put out of tune.

Shak.

, v.t.

To make incapable of harmony.

Untune that string.

To disorder.

Untun'd and jarring senses.

untune ‎(third-person singular simple present untunes, present participle untuning, simple past and past participle untuned)

(transitive) To make incapable of harmony, or of harmonious action; to put out of tune.
Shakespeare.