fathomable

Pain and pleasure are conditions of the soul; conditions which have a definite and quite fathomable limit.

They are fathomable; for carried to a certain pitch of intensity they end in ecstasy or they end in death.

They are fathomable; for even in the souls of "the immortals" they are only instruments of life warring against death.

The twitching would disappear for a time for no fathomable reason, and reappear again.

But in every other sense, in all that touches the fathomable business of daylight, she has been a conspicuous success.