in.de.fea.si.bleadj.(形容词)That cannot be annulled or made void:不能取消的,不能废止的:例句:an indefeasible claim; indefeasible rights.一项不能取消的声明;不能废除的权利【引伸】in.defea.sibil.ityn.(名词)in.defea.siblyadv.(副词)