Abbott-Smith Manual Greek Lexicon
ἄθεσμος (G113)
2 **† ἄθεσμος , -ον ( θεσμός , law , custom ), [in LXX: III Mac 5:12 6:26 *;] lawless , esp. of those who violate the law of nature and conscience (cf. MM, VGT , s.v.): II Pe 2:7 3:17 .† SYN. : ἀθέμιτος , ἄνομος , κακός , πονηρός , φαῦλος (v. Tr., Syn. , §lxxiv; DCG , ii, 821 b ).
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain