ἁγνός, -ή, -όν (< ἅγος, v.s. ἅγιος), [in LXX chiefly for טָהוֹרH2889 (Pss, and Pr. only), also II Mac 13:8, IV Mac 18:7, al.;] 1.free from ceremonial defilement , in a condition prepared for worship (for exx. of pagan usage, V. MM, VGT, s.v.). 2.holy, sacred, venerable (II Mac 13:8). 3. As in OT (cl.), pure, chaste, undefiled, guiltless(a) of persons: II Co 7:1111:12, I Ti 5:22, Tit 2:5, I Jo 3:3; (b) 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, 459a though Westc. (Epp. Jo., 101) notes a distinction between them.
Henry George Liddell, Robert Scott, A Greek-English Lexicon, ἁγνός
katabiblon.com Wiki Lexicon of the Greek New Testament and Concordance, ἁγνός