unwarrantably

In inexcusable fashion

In a manner that cannot be justified or defended.

The adverb form of unwarrantable, describing actions taken without adequate grounds or authorization: The committee unwarrantably delayed the investigation.

It suggests overstepping proper bounds or acting without sufficient cause.

unjustified

baseless

Lacking factual support

unsubstantiated · unjustified · unproven · without cause · unprovoked · uncalled-for · gratuitous · needless · unnecessary · unmotivated

irrational

illogical

Contrary to valid reasoning

preposterous · senseless · fallacious · specious · invalid · flawed · unsound · faulty · erroneous · misguided

excessive

disproportionate

Not properly scaled

extravagant · overreaching · overkill · unreasonable · outrageous · unconscionable · extreme · undue · intemperate · overblown

indefensible

unjustifiable

Cannot be reasonably defended

illegitimate · wrongful · improper · inappropriate · unacceptable · unconscionable · reprehensible · deplorable · indefensible

arbitrary

capricious

Subject to sudden changes

subjective · biased · prejudiced · partial · discriminatory · unfair · unjust · high-handed · despotic · autocratic

Opposites
justification

unwarrantablyjustifiably

With valid grounds

defensibly · reasonably · legitimately · excusably · allowably

Family

unwarrantable

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