say it: STURN-nuhs
sternness is a noun meaning "the quality (as of scenery) being grim and gloomy and forbidding". It carries 2 recorded senses.
the quality (as of scenery) being grim and gloomy and forbidding
“the sternness of his surroundings made him uncomfortable”
uncompromising resolution
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for sternness come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.