αἰφνίδιος G160
aiphnídios · aheef-nid'-ee-os · Adjective
from a compound of Α (as a negative particle) and φαίνω (compare ἐξαίφνης) (meaning non-apparent); unexpected, i.e. (adverbially) suddenly:--sudden, unawares.
2 Occurrences in the King James Bible
Luke 21:34And take heed to yourselves, lest at any time your hearts be overcharged with surfeiting, and drunkenness, and cares of this life, and so that day come upon you unawares.
1 Thessalonians 5:3For when they shall say, Peace and safety; then sudden destruction cometh upon them, as travail upon a woman with child; and they shall not escape.