(about a person) not having enough insurance （人）保险（额）不足的◆an underinsured motorist 保险额不足的驾车者◆attempts to increase health coverage for the underinsured 为扩大保额不足者健康保险承保范围所作的努力
(about a thing) insured for less than it is worth （物品）保险（额）不足的◆an underinsured vehicle 保险额不足的车辆