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irreversible

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irreversible
irreversible AC /ˌɪrɪˈvɜːsəbəl◂, ˌɪrɪˈvɜːsɪbəl◂ $ -ɜːr-/ adjective
 Word Family: noun: reversal, reverse; adjective: reverse, reversibleirreversible; verb: reverse
1. irreversible damage, change etc is so serious or so great that you cannot change something back to how it was before
   OPP  reversible:
    Fossil fuels have caused irreversible damage to the environment
2. if an illness or bad physical condition is irreversible, it will continue to exist and cannot be cured:
    Miller is in an irreversible coma.
    irreversible blindness
—irreversibly adverb:
    His reputation was irreversibly damaged by the affair.