'Unjust' in the Bible

Servants, be submissive to your masters with all [proper] respect, not only to those who are good and kind, but also to those who are unreasonable.

For this finds favor, if a person endures the sorrow of suffering unjustly because of an awareness of [the will of] God.

For indeed Christ died for sins once for all, the Just and Righteous for the unjust and unrighteous [the Innocent for the guilty] so that He might bring us to God, having been put to death in the flesh, but made alive in the Spirit;