Abbott-Smith Manual Greek Lexicon
ἁγνός (G53)
10 ἁγνός , -ή, -όν ( ἅγος , v.s. ἅγιος ), [in LXX chiefly for טָהוֹר (Pss, and Pr. only), also II Mac 13:8 , IV Mac 18:7 , al.;] free from ceremonial defilement , in a condition prepared for worship (for exx. of pagan usage, V. MM, VGT , s.v.). holy , sacred , venerable ( II Mac 13:8 ). As in OT (cl.), pure , chaste , undefiled , guiltless ; of persons: II Co 7:11 11:12 , I Ti 5:22 , Tit 2:5 , I Jo 3:3 ; of things: Phl 4:8 , Ja 3:17 , I Pe 3:2 .† SYN. : εἰλικρινής (q.v.), pure , primarily as winnowed, purged, first found in ethical sense in NT ( sincere ). On the equivalence of ἁ. and καθαρός (q.v.), v. DCG , ii, 459 a though Westc. ( Epp. Jo. , 101) notes a distinction between them.
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain