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