unjustifiable

US /ʌnˌdʒʌs.təˈfaɪ.ə.bəl/
UK /ʌnˌdʒʌs.təˈfaɪ.ə.bəl/
1.

không thể biện minh được

unacceptable and wrong because there is no good or fair reason for it:

:
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His behavior was unjustifiable.