In*su"per*a*ble (?), a. [L. insuperabilis: cf. OF. insuperable. See In- not, and Superable.] Incapable of being passed over or surmounted; insurmountable; as, insuperable difficulties.

And middle natures, how they long to join,
Yet never pass the insuperable line?

The difficulty is enhanced, or is . . . insuperable.
I. Taylor.

Syn. -- Impassable; insurmountable; unconquerable.

-- In*su"per*a*ble*ness, n. -- In*su"per*a*bly, adv.