unaccountable

1. ADJ Something that is unaccountable does not seem to have any sensible explanation. 难以解释的[usu ADJ n]

For some unaccountable reason, it struck me as extremely funny. 很难解释是什么原因让我觉得它极为可笑。

2. unaccountably

And then, unaccountably, she giggled. 然后，莫名其妙地，她咯咯笑了。

3. ADJ If you describe a person or organization as unaccountable, you are critical of them because they are not responsible to anyone for their actions, or do not feel they have to explain their actions to anyone. 无解释责任的; 不担负责任的[表不满]

Economic policy should not be run by an unaccountable committee of governors of central banks. 经济政策不应该由中央银行行长组成的不负责任的委员会来施行。