Abbott-Smith Manual Greek Lexicon
ἄ-κακος (G172)
2 ἄ-κακος , -ον , [in LXX for פְּתִי , תָּם , etc.;] as in cl. (Æsch., Plat., al.), of persons, simple , guileless : Ro 16:18 , He 7:26 (cf. Cremer, 327); of things, undamaged (? MM, VGT , s.v.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain