unplumbable

adj

unplumbable

adj

Etymology From un- + plumbable.

1

Not plumbable; unfathomable.

Either because it was a less toxic species, or because by now Doug was growing immunized, or for some other unplumbable reason, in this case the effects were no worse than those from a bee sting.1988, David Quammen, The Flight of the Iguana:

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