/ ˌɪrɪˈvɜːsəbl; NAmE -ˈvɜːrs-/ adjective
that cannot be changed back to what it was before :
an irreversible change / decline / decision
irreversible brain damage (= that will not improve)
OPP reversible
► ir·re·vers·ibly / -əbli; NAmE / adverb
/ ˌɪrɪˈvɜːsəbl; NAmE -ˈvɜːrs-/ adjective
that cannot be changed back to what it was before :
an irreversible change / decline / decision
irreversible brain damage (= that will not improve)
OPP reversible
► ir·re·vers·ibly / -əbli; NAmE / adverb
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005