Where does “enervatus” come from?

enervatus (Latin) comes from Latin enervo, from Latin ēnervis, from Latin nervus, from Proto-Indo-European (s)new-.

Ancestry of “enervatus”, step by step

Step	Language	Word	Meaning
1	Latin	enervo	I remove the nerves and sinews; I enervate,...
2	Latin	ēnervis	—
3	Latin	nervus	A sinew, tendon, nerve, muscle; A cord, string or...
4	Proto-Indo-European	(s)new-	—