a. (UN-1 7 b.)
1615. G. Sandys, Trav., 171. He … confined the Royall progeny within high and vnascendable mountaines.
1628. Feltham, Resolves, II. [I.] xxix. 90. A Hill almost vn-ascendable.
1801. Southey, Thalaba, XII. xvi. The depth was unascendable.
