unbethink

From un- +‎ bethink.

unbethink (third-person singular simple present unbethinks, present participle unbethinking, simple past and past participle unbethought)

1. (obsolete, dialectal, reflexive) To change one's mind, or to forget.

   I unbethought myself.

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