From BiblePortal Wikipedia

King James Dictionary [1]

INJUS'TICE, n. L. injustitia in and justitia,justice.

1. Iniquity wrong any violation of another's rights, as fraud in contracts, or the withholding of what is due. It has a particular reference to an unequal distribution of rights, property or privileges among persons who have equal claims. 2. The withholding from another merited praise, or ascribing to him unmerited blame.

Webster's Dictionary [2]

(1): ( n.) An unjust act or deed; a sin; a crime; a wrong.

(2): ( n.) Want of justice and equity; violation of the rights of another or others; iniquity; wrong; unfairness; imposition.

Charles Buck Theological Dictionary [3]