Definition of "plumbless" []

• Incapable of being measured or sounded with a plummet or lead-line; unfathomable.

The Century Dictionary (Public Domain)

• "With his unbending, utilitarian, matter – of – fact face, he hardened her again; and the moment shot away into the plumbless depths of the past, to mingle with all the lost opportunities that are drowned there."
• "His dark eyes were large, beautiful with plumbless wisdom."
• "Seeing them, the Savage made a grimace; but he was to become reconciled to them in course of time; for at night they twinkled gaily with geometrical constellations, or else, flood-lighted, pointed their luminous fingers (with a gesture whose significance nobody in England but the Savage now understood) solemnly towards the plumbless mysteries of heaven."