FORTHINK
Etymology
Verb
forthink (third-person singular simple present forthinks, present participle forthinking, simple past and past participle forthought)
(transitive, obsolete, impersonal) To cause distress or regret to; cause to regret or repent; to vex.
(reflexive, obsolete) To regret; repent.
(transitive, obsolete) To regret.
(intransitive, obsolete) To repent, be sorry for.
(transitive, obsolete) To change one's mind about; to renounce.
Source: Wiktionary
For*think", v. t.
Definition: To repent; to regret; to be sorry for; to cause regret. [Obs.]
"Let it forthink you." Tyndale.
That me forthinketh, quod this January. Chaucer.
Source: Webster’s Unabridged Dictionary 1913 Edition