Webster's Revised Unabridged Dictionary · 1913

Unrighteous

Unrighteous , adjective

[Old English unrightwise, Anglo-Saxon unrihtwīs. See Un- not, and Righteous.]

1.
Not righteous; evil; wicked; sinful; as, an unrighteous man.
2.
Contrary to law and equity; unjust; as, an unrighteous decree or sentence.