irremediable
[adjective]
Synonyms: irrecoverable, irreclaimable, irredeemable, irreparable, irretrievable, hopeless, cureless, immedicable, impossible, incurable, insanable, uncorrectable, uncurable, unrecoverable

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Antonyms: remediable

[TahlilGaran] English Synonym Dictionary ▲

ir‧re‧me‧di‧a‧ble /ˌɪrɪˈmiːdiəbəl◂/ adjective formal
[Date: 1500-1600; Language: Latin; Origin: irremediabilis, from remediare 'to cure']
so bad that it is impossible to make it better

[TahlilGaran] Dictionary of Contemporary English ▲