unjustifiably

Lacking valid reason

Unjustifiably means without adequate justification or good reason.

It modifies actions or judgments that lack proper grounds: The project was unjustifiably delayed, She felt unjustifiably accused.

The word carries implicit criticism—whatever happened shouldn't have, given the circumstances.

baseless

groundless

Lacking factual support

unwarranted · specious · spurious · unproven · unverified · fabricated · conjectural · uncorroborated · undocumented · unattested

unfair

inequitably

In an unequal manner

partially · one-sidedly · tendentiously · invidiously · without cause · unethically · improperly · inappropriately · unrighteously · partisan

irrational

illogically

Contrary to valid reasoning

senselessly · preposterously · ludicrously · incoherently · foolishly · irrationally · mindlessly · thoughtlessly · recklessly · heedlessly

excessive

disproportionately

Beyond fair ratio

exorbitantly · unreasonably · extravagantly · unnecessarily · unduly · gratuitously · extortionately · preposterously · outrageously · unconscionably

Opposites
justification/warrant

unjustifiablyjustifiably

With valid grounds

justly · warrantedly · reasonably · legitimately · validly

reasonableness/rationality

unjustifiablyreasonably

To a sensible degree

rationally · sensibly · logically · understandably · soundly

moral defensibility

unjustifiablyexcusably

In a forgivable manner

forgivably · pardonably · defensibly · acceptably · permissibly

Family

unjustifiable

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