ἐξαπίναιος
From LSJ
ἔνδον γὰρ ἁνὴρ ἄρτι τυγχάνει, κάρα στάζων ἱδρῶτι καὶ χέρας ξιφοκτόνους → yes, the man is now inside, his face and hands that have slaughtered with the sword dripping with sweat
English (LSJ)
proparox., or ἐξαπῐν-αῖος, α, ον, or ος, ον,
A = ἐξαιφνίδιος, Hp.Acut.28, X.Hier.10.6, Plb.25.2.1, Call.Jov.50, Ruf. ap. Orib.6.38.25. Adv. -ως Hp.Art.43, Th.3.3, al.