αἰφνίδιος, ον,
unforeseen, sudden, [[ 4th-5th c.BC: Aeschylus Tragicus “Prometheus Vinctus” 680, 5th c.BC: Thucydides Historicus 2.61, 4th c.BC: Aristoteles Philosophus “Ethica Nicomachea” 1117a18; ἀφικνοῦνται αἰφνίδιοι τοῖς Χίοις 5th c.BC: Thucydides Historicus 8.14] Refs 5th c.BC+]. adverb -ίως[[ [prev. author] 2.53;] Refs] also -ιον [[1st-2nd c.AD: Plutarchus Biographus et Philosophus “Numa” 15] Refs 1st c.AD+]. αἰφνιδιοτυχής, ές, profiting by strokes of good fortune, [[Vett. Val. 18.16.] Refs]