Akeraios (G185) literally means 'unmixed' (alpha-privative + kerannymi: to mix). It describes moral purity and innocence — something undiluted by evil, uncontaminated. Jesus commands his disciples to be 'wise as serpents and innocent [akeraioi] as doves' (Matthew 10:16). Paul similarly urges the Philippians to be 'blameless and innocent [akeraioi], children of God without blemish.'
Akeraios describes a holiness that is positively pure, not merely negatively absent of wrong. Like undiluted wine or unmixed metal, the innocent person is not adulterated with compromise. The dove symbol (Genesis 8; Matthew 3:16) carries this sense — the Spirit descends as a dove precisely because God's nature is pure and undivided. This is the goal of sanctification: unmixed devotion to God.