The Greek adjective akakos (ἄκακος) is formed from the alpha-privative and kakos (G2556, evil/bad). It means guileless, innocent, without malice, simple, or free from evil. It describes a character untainted by wickedness.
Akakos appears in two significant New Testament passages. In Romans 16:18, Paul warns against those who 'deceive the minds of naive people' — the word akakoi describes the guileless believers susceptible to smooth-talking deceivers. In Hebrews 7:26, Jesus is described as the perfect high priest: 'holy, blameless, pure, set apart from sinners, exalted above the heavens' — and akakos (innocent/guileless) is one of his priestly qualifications. The sinlessness of Christ is not merely moral perfection but absolute guilelessness — no deception, no hidden agenda, no malice in his heart.