Berry-3

(G5880) Synonyms for Sincere: aplous (ἁπλοῦς G573), akeraios (ἀκέραιος G185), akakos (ἄκακος G172), adolos (ἄδολος G97).

(ἁπλοῦς G573) aplous is literally spread out without folds, and hence means single, simple, without complexity of character and motive. In the N. T. this idea of simplicity is always favorable; in classical Greek the word is also occasionally used in an unfavorable sense, denoting foolish simplicity. akeraios also means simple, literally free from any foreign admixture, unadulterated, free from disturbing elements. akakos in Heb 7:26 means one in whom exists absence of all evil, and so by implication the presence of all good. It passes also through the merely negative meaning of absence of evil, found in the Septuagint, to the unfavorable meaning of simple, easily deceived, credulous, which is found in Rom 16:18. adolos, occurring only in 1Pe 2:2, means sincere, unmixed, without guile.