Synonyms of unjustifiable in English:

unjustifiable


See definition of unjustifiable

adjective

1‘an unjustifiable extravagance’

SYNONYMS
indefensible, inexcusable, unforgivable, unpardonable
uncalled for, unprovoked, without justification, without cause, without reason, unreasonable
regrettable, unacceptable, unworthy, remiss, blameworthy, culpable, unwarrantable
excessive, immoderate, unconscionable, outrageous
ANTONYMS

justifiable, reasonable

2‘an unjustifiable slur on his character’

SYNONYMS
groundless, unfounded, without foundation, foundationless, baseless, without basis, unsupported, unsubstantiated, unconfirmed, uncorroborated, invalid, untenable, weak, shaky, flawed, defective
ANTONYMS

justifiable, true