1627. Jackson, Creed, VI. v. § 1. Some Schoole-braines have beene so puzled in passing this unsoundable gulfe, as to suspect [etc.].
1660. F. Brooke, trans. Le Blanc’s Trav., 216. The so famous Nile … sallying, as some say, out of an unsoundable lake.
a. 1684. Leighton, Comm. 1 Pet. ii. (1693), 295. The thoughts of God are deep, and unsoundable by us.
1843. Carlyle, Past & Pr., III. xi. There shall be a depth of Silence in thee…; a Silence unsoundable.
1884. Graphic, 4 Oct., 358/2. His eyes will be large, black, with long lashes and unsoundable.
1897. Baring-Gould, Guavas, vii. One track … betwixt unsoundable bogs.
