When something is unwarranted it's not called-for under the given circumstances. For example, debating the merits of someone's talent is one thing, but calling them stupid is unwarranted.

I thought the applause was unwarranted. After all, all the guy did was stand there and point for two hours. And when that lady started screaming? That was unwarranted, too: all I did was give her a flat. It was an accident! Think of it this way: when the police want to search your home, they have to get a "warrant" — a document that allows them to enter. To go into your home without a warrant would be unwarranted. A warrant is a kind of justification; without that justification, something could be called unwarranted.

Definitions of unwarranted

adj incapable of being justified or explained

indefensible, insupportable, unjustifiable, unwarrantable
without excuse or justification

adj lacking justification or authorization

unwarranted limitations of personal freedom”
undue, unjustified
not reasonable; not showing good judgment

adj without a basis in reason or fact

unwarranted jealousy”
baseless, groundless, idle, unfounded, wild
not sustained or maintained by nonmaterial aid

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