† apoˈtactical,a.Obs.rare—1. [f.Gr. ἀπότακτ-ος, vbl.adj.f. ἀποτάσσειν to set apart, ἀποτάσσεσθαι (cf.Luke ix. 61) to say adieu to, renounce + -ical.] Renouncing, recreant. 1627Bp. Hall No Peace with Rome lvii. 661 Monsters of men..apotacticall and apostaticall miscreants.