unchristen

un- +‎ christen

unchristen (third-person singular simple present unchristens, present participle unchristening, simple past and past participle unchristened)

1. (transitive) To render unchristian.
   • 1644, J[ohn] M[ilton], The Doctrine or Discipline of Divorce: […], 2nd edition, London: [s.n.], →OCLC, book:

     to constrain him furder were to unchristen him , to unman him , to throw the mountain of Sinai upon him

2. To undo the act of christening.

• “unchristen”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.