The driver was found culpable in the accident because he was using his phone while driving.

culpable 来自拉丁语 culpa（过错、罪责），加上后缀 -able（能够...的），字面意思是"能够被归咎的"。在现代英语中表示"应受责备的""负有责任的"，通常用于法律或正式语境中描述过失或责任。