ἐξαπίναιος
From LSJ
ζηλοῦτε δὲ τὰ χαρίσματα τὰ μείζονα. Καὶ ἔτι καθ᾽ ὑπερβολὴν ὁδὸν ὑμῖν δείκνυμι (1 Corinthians 12:31) → But go ahead and strive for the greater gifts. And I'm about to show you a still more excellent way.
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.