forethink verb2 •(rare) To plan (something) in advance; think, consider, or contrive beforehand; prognosticate.O vain sorceress , that could be wary to avoid the punishment of Saul ; careless to avoid the judgment of God ! Could we forethink what our sin would cost us , we durst not but be innocent — 1612 •(rare) To think about beforehand; to anticipate.[…]and the soul of every man / Prophetically doth forethink thy fall. — 1597 formsforethought · forethinking · forethinks