Definition.com
Sin is a word meaning to 'miss the point' the point is eternal life which is here and now.
Definition.com
Sin is a world-ruling power, or personified principle, which makes men his captives, shuts them up in prison, and pronounces condemnation upon them.
Definition.com
Sin is a refusal to grow, a refusal to love, a refusal to get committed, to be concerned, and to take risks.
Definition.com
Sin is a recurring kinetic act of wickedness. Thus, it occurs in the plural, as 'sins' such that evil is then a series of individual actions overtly and responsibly committed.
Definition.com
Sin is a mighty power in the bonds of which humanity suffers. Therefore, redemption must be the sole act of God with no human involvement.