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unjustifiable

adjective
 
 
/ʌnˌdʒʌs.tɪˈfaɪ.ə.bl̩/

Definition

unacceptable and wrong because without any good or fair reason: His behaviour was unjustifiable. unjustifiable expenseUnsuitable and unacceptable unjustifiably
 
 
/-bli/ adverb disapproving
(Definition of unjustifiable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of unjustifiable