Abbott-Smith Manual Greek Lexicon
ἀληθής (G227)
25 ἀληθής , -ές ( λήθω = λανθάνω , hence primarily, unconcealed, manifest ; hence, actual, real ), [in LXX for אֶמֶת , etc.;] of things, true , conforming to reality: Jo 4:18 5:31,32 6:55 (= ἀληθινός , q.v.) Jo 8:13,14 , 17 10:41 19:35 21:24 , Ac 12:9 , Phl 4:8 , Tit 1:13 , I Pe 5:12 , II Pe 2:22 , I Jo 2:8 , III Jo 12 ; of persons, truthful : Mt 22:16 , Mk 12:14 , Jo 3:33 7:18 8:26 , Ro 3:4 , II Co 6:8 .† SYN. : ἀληθινός , real, genuine, ideal , as opp. to spurious or imperfect ἀληθής , true to fact, as opp. to false, lying, denotes the actuality of a thing: ἀληθινός , its relation to the corresponding conception. (Cf. Tr., Syn. , § viii; Cremer, 84 f., 631 Abbott, JV , 234 f.; DB , iv, 818 f.; MM, VGT , s.vv.)
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain