unaccountably
adv. 不能说明地；不可解释地；无责任的
例句
He has been unaccountably delayed.
他被莫名其妙地耽误了。
《牛津词典》
And then, unaccountably, she giggled.
然后，莫名其妙地，她咯咯笑了。
《柯林斯英汉双解大词典》
Animals are also affected, particularly before earthquakes, snakes have been observed to come out of hibernation, rats to flee from their burrows, dogs howl and cats jump about unaccountably.
特别在地震前，动物也会受到影响，蛇被观察到从冬眠中醒来，老鼠从洞穴中逃走，狗会狂吠，猫会莫名其妙地跳来跳去。
