Where does “uncausative” come from?

uncausative (English) comes from English causative, from French causatif, from Latin causātīvus, from Latin causa, from Old Latin caussa, from Proto-Indo-European kawd-teh₂.

Ancestry of “uncausative”, step by step

uncausative traces back through two separate lines of ancestry.

via English causative

StepLanguageWordMeaning
1Englishcausativeacting as a cause; expressing a cause or...
2Frenchcausatifcausative
3Latincausātīvus
4Latincausacause, reason; case, claim, contention; motive,...
5Old Latincaussacause, reason, purpose; case, claim; Archaic form...
6Proto-Indo-Europeankawd-teh₂

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Proto-Indo-European kawd-teh₂