Unsolve

//ʌnˈsɒlv// verb

Definitions

Verb
  1. 1
    To solve. obsolete

    "Perchance, my Fancy would have bin so kinde, / T‘ unsolve the doubts of my perplexed minde."

  2. 2
    To undo or remove the solution to a problem; to put something into an unsolved state.

    "“But I cannot allow you to use my cousin to solve or, I suppose, more precisely, to unsolve your case.”"

Etymology

From un- + solve.

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