plummetless

adj

adj

Etymology From plummet + -less.

Unfathomably deep; unplumbable.

[…] and suggests a crowd of problems quite beyond the reach of solution, leading, indeed, into plummetless mystery.1876, Scottish Rite (Masonic order). Supreme Council for the Northern Jurisdiction, Proceedings of the Massachusetts Council of Deliberation (page 94)
There are other stars in the plummetless heaven.1881, Samuel Miller Hageman, Once, page 124:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.