unwarrantedly

Lacking proper grounds

In a manner that lacks justification or authorization.

The adverb typically modifies actions or claims that overstep proper bounds: The police unwarrantedly searched the vehicle.

It often carries a tone of criticism—suggesting someone acted without sufficient reason or right: She felt unwarrantedly blamed for the project's failure.

baseless

groundless

Lacking factual support

unfounded · unproven · specious · spurious · fallacious · invalid · illogical · fabricated · conjectural · erroneous

arbitrary

capriciously

In unpredictable fashion

erratically · impulsively · indiscriminately · unpredictably · aimlessly · unsystematically · unmethodically · inconsistently · casually · baselessly

excessive

disproportionately

Beyond fair ratio

unduly · gratuitously · unnecessarily · superfluously · extravagantly · overboard · overkill · redundantly · exorbitantly · profusely

presumptuous

presumptuously

With unwarranted boldness

brazenly · forwardly · arrogantly · boldly · cheekily · overconfidently · intrusively · officiously · meddlesomely · self-importantly

Opposites
justification

unwarrantedlyjustifiably

With valid grounds

warrantedly · justly · deservedly · legitimately · rightfully

Family

unwarranted

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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G