- Original: αἰφνίδιος - Transliteration: Aiphnidios - Phonetic: aheef-nid'-ee-os - Definition: 1. unexpected, sudden, unforeseen - Origin: from a compound of G1 (as a negative particle) and G5316 [cf G1810 ] - TDNT entry: None - Part(s) of speech: Adjective - Strong's: From a compound of G1 (as a negative particle) and G5316 (compare G1810 ) (meaning non apparent); unexpected that is (adverbially) suddenly: - sudden unawares. Total KJV Occurrences: 1 • sudden, 1 1 Thessalonians 5:3