αἰνός · ainos — LSJ
= δεινός, dread, horrible, freq. in Hom., of feelings, ἄχος, χόλος, τρόμος, κάματος, ὀϊζύς, Il. 4.169, 22.94, 7.215, 10.312, Od. 15.342; of states and actions, as δηϊοτής, πόλεμος, μόρος, Il. 5.409, Od. 8.519 (Sup.), Il. 18.465; of persons, dread, terrible, esp. of Zeus, αἰνότατε Κρονίδη Il. 4.25, etc.; σύ γʼ αἰνοτάτη, of Pallas, 8.423; of monsters or animals, πέλωρα Od. 10.219; ὄφις Hes. Fr. 14; λῖς Theoc. 25.252.
Adv. -νῶς terribly, i.e. strangely, exceedingly, Il. 10.38; ἔοικέ τινι 3.158, Od. 1.208; φιλέεσκε 1.264; ἐπὶ γόνυ κέκλιται A. Pers. 930 (lyr.); φεύγειν τι Hdt. 4.76; with Adj., αἰ. κακός terribly bad, Od. 17.24; αἰ. πικρός Hdt. 4.52; τῆς Σκυθικῆς αἰ. ἀξύλου ἐούσης ib. 61:—neut. pl. αἰνά as Adv., Il. 1.414: Sup. -ότατον 13.52.