G1819 ἐξάπινα (exápina)

KJV renderings: suddenly
Strong's definition: of a sudden, i.e. unexpectedly
Derivation: from G1537 (ἐκ) and a derivative of the same as G160 (αἰφνίδιος);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.