unplumbable
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plumbable — adjective Capable (as depths) of being plumbed. Ant: unplumbable … Wiktionary
unplumbed — adjective 1》 not provided with plumbing. 2》 not fully explored or understood. Derivatives unplumbable adjective … English new terms dictionary
unplumbed — adj. 1 not plumbed. 2 not fully explored or understood. Derivatives: unplumbable adj … Useful english dictionary