Strong's G531 · Greek

ἀπαράβατος

aparabatos · ap-ar-ab'-at-os

from 1 (as a negative particle) and a derivative of 3845; not passing away, i.e. untransferable (perpetual)

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 1 *† ἀ-παρά-βατος , -ον ( παραβαίνω ), inviolable , and so unchangeable: He 7:24 (v. Westc., in l.; Cremer, 653; MM, VGT , s.v.).† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain