subterraneanness means the quality of being subterranean. Lexicurio rates it Sui generis — a strength score of 95 out of 100.
Etymology
From subterranean + -ness.
noun
- The quality of being subterranean.“This subject has been investigated experimentally in order to obtain so far as possible a means of expressing mathematically the relative “subterraneanness” of various species of noctuid larvae.”