Synonyms of unjustifiable

adjectiveThat cannot be justified, excused or pardoned.

• indefensible
• inexcusableNot excusable.
• unforgivableNot forgivable; inexcusable.
• unjustifiedNot justified, having no justification, unwarranted.
• unpardonableImpossible to pardon; impossible to excuse or justify.
• unprovokedHappening without provocation.
• unreasonable
• regrettableAble to be regretted, especially deserving of regret.
• unacceptable
• unworthyNot worthy; lacking value or merit; worthless.
• remiss
• blameworthyDeserving blame or censure; reprehensible.
• culpableMeriting condemnation, censure or blame, especially as something wrong, harmful or injurious; blameworthy, guilty.
• unwarrantableNot warrantable; indefensible; not vindicable; not justifiable.
• excessiveExceeding the usual bounds of something; too much (of amount); extravagant; immoderate.
• immoderateNot moderate; excessive.
• unconscionable
• outrageous