Hamartanō (ἁμαρτάνω) is the primary New Testament verb for sinning, appearing about 43 times. The related noun hamartia (G266) appears over 170 times. The word's root meaning is "to miss the mark" — from archery, where the arrow fails to hit the target. Applied morally and spiritually, it describes any thought, word, deed, or omission that fails to hit God's standard of righteousness.
The word is used across a wide range: deliberate rebellion, moral failure, error, and the condition of humanity in Adam. It is never used lightly in Scripture — sin always matters to God.
The NT builds its entire soteriology on the diagnosis that all have sinned (pantes hēmarton — Romans 3:23). The aorist tense in that verse suggests both the original act (Adam's sin) and its repeated consequences in every human life. Sin is not merely behavioral deviation but a power that enslaves — Paul personifies it as a reigning force (Romans 6) from which Christ liberates.
The gospel is precisely the answer to hamartanō: "Christ Jesus came into the world to save sinners" (1 Tim. 1:15). The cross is God's definitive response to the human problem of missing the mark. John gives the reassurance: "If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness" (1 John 1:9). The Christian life involves both freedom from sin's dominion (Romans 6:14) and ongoing reliance on Christ's advocacy when we fall (1 John 2:1-2).