Where does “supinity” come from?

supinity (English) comes from English supine, from Latin supīnus, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

supinity (English): The quality of being supine; negligence;...

Definitions

  1. The quality of being supine; negligence;...

Ancestry of “supinity”, step by step

supinity traces back through two separate lines of ancestry.

via English supine

StepLanguageWordMeaning
1EnglishsupineLying on its back; Reluctant to take action due...
2Latinsupīnuslying down with face upwards; supine, on one's back
3Proto-Indo-Europeanupóunder, below
4Proto-Indo-Europeanh₃ewp-—

via Latin supinitas

StepLanguageWordMeaning
1Latinsupinitas—
Every word from Proto-Indo-European h₃ewp- →Every word from Proto-Indo-European upó →Every word from Latin supīnus →