irresponsible

a.不负责任的

irrelevant, irrelevantly, irreligious, irremediable, irremediably, irremovable, irreparable, irreparably, irreplaceable, irrepressible, irrepressibly, irreproachable, irreproachably, irresistible, irresistibly, irresolute, irresolutely, irresolution, irrespective, irresponsibility, irresponsibly, irretrievable, irretrievably, irreverence, irreverent, irreverently, irreversible, irreversibly, irrevocable, irrevocably, irrigable, irrigate, irrigation, irritability, irritable, irritably, irritant, irritate, irritating, irritation,