justifiedly
justifiedly is an adverb that indicates an action or belief is supported by good reasons or is considered fair, right, or reasonable. It is derived from the adjective "justified," which means having a just cause or reason. When something is done justifiedly, it is not arbitrary or baseless but rather has a logical and defensible basis.
For example, a person might be justifiedly concerned about an upcoming exam if they have not studied.