inexcusable
[adjective]
Synonyms: unforgivable, indefensible, outrageous, unjustifiable, unpardonable, unwarrantable

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Antonyms: excusable
Contrasted words: allowable, blameless, defensible, forgivable, justifiable, pardonable, venial
Related Words: blamable, blameworthy, censurable, criticizable, impermissible, unallowable, unpermissible, intolerable, reprehensible

[TahlilGaran] English Synonym Dictionary ▲

in‧ex‧cu‧sa‧ble /ˌɪnɪkˈskjuːzəbəl◂/ adjective
[Word Family: verb: excuse; noun: excuse; adverb: inexcusably; adjective: excusable ≠ inexcusable]
inexcusable behaviour is too bad to be excused:
an inexcusable act of aggression
—inexcusably adverb

[TahlilGaran] Dictionary of Contemporary English ▲