The road here is only discoverable by its barren track, along the cultivated meadows.

Possibly truth is only discoverable by chance.

But, when Margaret spoke, a very slight tone of vexation was the only discoverable trace of any such emotion.

Actions are not moral or immoral in themselves, but in their consequences or relations, which are only discoverable in experience.

Francis privately concluded that the maraschino punch offered the only discoverable explanation of what the Countess had said to him.