unjustifiably
Definitions
In a manner that lacks a valid or acceptable reason or justification.
Without sufficient evidence or moral grounds to support an action or belief.
Examples
The manager was unjustifiably harsh when criticizing the intern's minor mistake.
He felt that he had been unjustifiably excluded from the decision-making process.
Synonyms
unreasonably unfairly unwarrantedly inappropriately without justification