Not fair, just or right.

The quality of being unjust; unfairness.

plural of unjustness

comparative form of unjust: more unjust

(law) a benefit gained at another's expense without legally justifiable grounds, such as one gained by mistake.

plural of unjust enrichment

In an unjust manner.

Not justified, having no justification, unwarranted.

simple past tense and past participle of unjustify

That cannot be justified, excused or pardoned.