Lexical Definition

‎ἄκακος‎ ákakos (ak'-ak-os) innocent G:A
from ‎Α‎ (as a negative particle) and ‎κακός‎

harmless, simple.

Usage: 8 forms in 15 verses
Form Translated As     In Verse(s)
ἄκακοσ innocent Heb.7.26
ἀκάκων naive Rom.16.18
ακάκουσ guileless LXX.Prov.13.6
ακάκου of guileless LXX.Prov.15.10
ακάκοισ to guileless LXX.Prov.1.4
άκακοσ guileless LXX.Prov.14.15
guileless man LXX.Prov.21.11
not wicked LXX.Job.2.3
άκακον guileless LXX.Job.8.20LXX.Job.36.5LXX.Jer.11.19
άκακοι O guileless ones LXX.Prov.8.5
and guileless LXX.Prov.2.20
guileless LXX.Ps.25.21LXX.Prov.1.22

Abbott-Smith

ἄ-κακος, -ον, [in LXX for פְּתִי, תָּם, etc.;]

(a) as in cl. (Æsch., Plat., al.), of persons, simple, guileless: Ro 16:18, He 7:26 (cf. Cremer, 327);
(b) of things, undamaged (? MM, VGT, s.v.).†

Abbott-Smith References

Book Refs
Romans 16:18
Hebrews 7:26

Liddell-Scott-Jones

ἄκακος-ος, ον,

unknowing of ill, guileless, [NT+5th c.BC+]

__2 innocent, simple (compare εὐήθης), [Refs 4th c.BC+]. adverb -κως[Refs 4th c.BC+]
__II unharmed, [Refs 7th c.BC+]
__II.2 unadulterated, [Refs 6th c.AD+]

LSJ Scripture Refs: Rom.16.18