adj.无法解释的；不能理解的；不负责任的
I have an unaccountable dislike to my dentist. 我对牙医有种无法解释的厌恶。
His mistake is quite unaccountable. 他的错误相当令人费解。
An insane person is unaccountable for his actions. 精神病患者对其行为不负任何责任。
