#0762 ἄσβεστος asbestos {as'-bes-tos}

 from G0001 (as a negative particle) and a derivative of G4570; TDNT - n/a; adj

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) unquenched, unquenchable
    1a) of eternal hell fire to punish the damned

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - unquenchable 2, never shall be quenched 2; 4

—Exhaustive Concordance (KJV Translation Frequency & Location)