Strong's Concordance

Original word: ἄθεσμος
Transliteration: athesmos
Definition (short): men
Definition (full): lawless

NAS Exhaustive Concordance

Word Origin: from alpha (as a neg. prefix) and thesmos (law, custom)
Definition: lawless
NASB Translation: unprincipled men (2).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From a (as a negative particle) and a derivative of tithemi (in the sense of enacting); lawless, i.e. (by implication) criminal -- wicked.

see GREEK a

see GREEK tithemi

KJV: And delivered just Lot, vexed with the filthy conversation of the wicked:
NASB: and if He rescued righteous Lot, oppressed by the sensual conduct of unprincipled men
KJV: Ye therefore, beloved, seeing ye know these things before, beware lest ye also, being led away with the error of the wicked, fall from your own stedfastness.
NASB: You therefore, beloved, knowing this beforehand, be on your guard so that you are not carried away by the error of unprincipled men and fall from your own steadfastness,