ἀΐδηλος

A. making unseen, annihilating, destructive: in Hom., as epith. of Arcs and Athena, Il. 5.897,880; πῦρ ἀ. 2.455, al., Emp. 109; ἠελίοιο ἔργ’ ἀΐδηλα Parm. 10.3; ἀΐδαλος τύχα Epigr.Gr. 240.5 (Smyrna); ἄτη Opp. H. 2.487; πότμος ib.1.150. Adv. ‐λως, = ὀλεθρίως, Il. 21.220.

II. Pass., unseen , unknown, obscure, v.l. in Il. 2.318, cf. Hes. Op. 756, A.R. 1.102, al.; unforeseen, ib.298; formless,4.681; unsubstantial, φρίκη Nic. Th. 727; as epith. of Hades, dark, gloomy, S. Aj. 608 (lyr.).