Where does “sternness” come from?

Sternness comes from English stern, which derives from Old English stierne, ultimately tracing to Proto-Indo-European h₂stḗr meaning strict or severe in demeanor.

sternness (English): The state or quality of being stern; The result...

Definitions

  1. The state or quality of being stern; The result...

Ancestry of “sternness”, step by step

StepLanguageWordMeaning
1EnglishSternHaving a hardness and severity of nature or manner
2EnglishternAny of various sea birds of the family Sternidae...
3Middle Englishterne
4Old Frenchternedull, dim
5Latinternasaccusative feminine plural of terni
6Latinternithree each; three at a time
7Latinterthrice
8Latinterr
9Old Latintris
10Proto-Italictrēsthree
11Proto-Indo-European*tréyes
Every word from Proto-Indo-European *tréyes