http://www.capitalmemorial.org/sindef.htm has this to say. (yes, I know this is a seventh day adventist site, but if they're right on something they just are, even if wrong in much of their beliefs. )
A deliberate act against the law of God. See 1 John 3:4. (The King James Version uses the word “transgression,” but the Greek word means “lawlessness,” which is deliberately choosing to live a life of sin.)
A mental consent to a temptation or a sinful desire, the sin of coveting. See Rom. 7:7,8. (See also Matt. 5:27,28; James 1:14; Prov. 24:9.)
Unbelief, a deliberate rejection of a Biblical truth. See Rom. 14:23. (See also John 3:18; John 16:8,9.)
Neglect of known duties or opportunity. See James 4:17. (See also James 2:14; Matt. 23:23; Matt. 25:43-46.)
Doing the wrong thing out of ignorance. See Lev. 5:17-19. (See also Luke 12:48; 1 Tim. 1:13.)
Our sinful natures, which we inherited from Adam. See Psalm 51:5; Psalm 58:3. (See also Rom. 5:19,20; Eph. 2:3b; Phil. 3:20,21.)
A law, principle, or constant force, dwelling in our sinful natures (indwelling sin in the flesh). This makes us slaves to sin. Therefore, holy living, in and of ourselves, is impossible. See Rom. 7:14, 20-23. (See also Luke 11:39; John 8:31-34.)
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Why didn't you continue on with your Greek/Hebrew definitions and show all of the different ways in which this word is used and what they ALL mean?
Chrys