subterraneous

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

adjective being or operating under the surface of the earth
adjective lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed); ; - Bertrand Russell

Adapted borrowing of Latin subterrāneus + -ous. Doublet of subterrane.

But the amazing vegetation of subterraneous land was not confined to gigantic mushrooms. — A Journey to the Centre of the Earth, Jules Verne
Their existence shows that the substratum is secondary limestone, abounding with subterraneous cavities. — A New Guide for Emigrants to the West, John Mason Peck
They also dig subterraneous caves, [99] and cover them over with a great quantity of dung. — The Germany and the Agricola of Tacitus, Cornelius Tacitus

subterranean

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