irreplaceable

adj that cannot be replaced if lost or damaged （若失掉或损坏时）不能替代的: an irreplaceable antique vase, the only one of its kind 一件举世无双、 独一无二的古花瓶.

irrecoverably, irredeemable, irredeemably, irreducible, irreducibly, irrefutable, irrefutably, irregular, irregularity, irregularly, irrelevance, irrelevancy, irrelevant, irrelevantly, irreligious, irremediable, irremediably, irremovable, irreparable, irreparably, irrepressible, irrepressibly, irreproachable, irreproachably, irresistible, irresistibly, irresolute, irresolutely, irresolution, irrespective, irresponsibility, irresponsible, irresponsibly, irretrievable, irretrievably, irreverence, irreverent, irreverently, irreversible, irreversibly,