Webster 1913 Edition
Acting contrary to the standard of right; not animated or controlled by justice; false; dishonest;
unjustman or judge
Contrary to justice and right; prompted by a spirit of injustice; wrongful;–
Webster 1828 Edition
1.Not just; acting contrary to the standard of right established by the divine law; not equitable; as an unjust man.
2.Contrary to justice and right; wrongful; as an unjust sentence; an unjust demand; an unjust accusation.
unjust (comparative more unjust, superlative most unjust)
Beware that unjust and injustice use different prefixes (French injustice was borrowed into English, but injuste was not). injust is archaic and unjustice is obsolete.
not fair, just or right