inexplicable

There is no good reason beyond that inexplicable American habit of following beaten paths.

Till Antonio de Dominis the rainbow was considered as an inexplicable miracle.

But she gave up that point as being only one more of the inexplicable tortuosities of a man's sense of honour.

Whence came all the faiths but from that inexplicable feeling of the heart, that surge and swell arising we know not whence?

To Gilbert much of this feeling was inexplicable, because he was ignorant of the circumstances which had called it into existence.

Unless we admit it most of the facts of comparative anatomy and physiology are inexplicable.