ἄφνω,
Adv.
unawares, of a sudden, A. Fr. 195, E. Med. 1205, Alc. 420, Eup. 268, etc.: in Prose, Th. 4.104, 7.37, D. 21.41, [Act 2:2], etc.: - also ἄφνως, Epigr.Gr. 468.
G869 — ἄφνω
adverb (akin to αἰφνης, see in αἰφνίδιος above), suddenly: [Act 2:2]; [Act 16:26]; [Act 28:6]. (the Sept.; (Aeschylus), Thucydides and subsequent writings.)