/ ˌɪnɪkˈskjuːzəbl; NAmE / adjective
too bad to accept or forgive
SYN unjustifiable :
inexcusable rudeness
OPP excusable
► in·ex·cus·ably / -əbli; NAmE / adverb
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WORD ORIGIN
late Middle English : from Latin inexcusabilis , from in- not + excusabilis able to be excused (from excusare to free from blame, from ex- out + causa accusation, cause).