Strong's Greek #126
ἀϊδίοις

Englishman's Concordance (References)

ἀϊδίοις aidiois — 1 Occurrence

Jude 1:6 - Adj-DMP
GRK:ἡμέρας δεσμοῖς ἀϊδίοις ὑπὸ ζόφον
NAS: He has kept in eternal bonds
KJV: he hath reserved in everlasting chains
INT: day in chains eternal under darkness