Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)
cannot be undone; can't be recovered from
see 取り返しがつかない
あんな人種差別の発言をするなんて、あの政治家も取り返しのつかないことを口にしたものだ。That politician put his foot in his mouth when he made those racist comments.
Also written 取返しのつかない【とりかえしのつかない】