Abbott-Smith Manual Greek Lexicon
ἀπλότης (G572)
8 ἀπλότης , -ητος, ή ( ἁπλοῦς ), [in LXX: II Ki 15:11 ( תֹּם ), I Ch 29:17 ( לֵבָב ישֶׁר , ἁ. τῆς καρδίας , cf. Col 3:22 , where v. Lft.), Wi 1:1 , al.;] simplicity , sincerity : Ro 12:8 , II Co 11:3 , Eph 6:5 , Col 3:22 ; as manifested in generous, unselfish giving, liberality , graciousness : II Co 8:2 9:11 , 13 (v. ICC , Ro. , 12:8 ; Hort, Ja. , 1:5 , and v.s. ἁπλῶς ).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain