English

inergetic

From in- + energetic.

Proto-Indo-European *h₁én ‘in’

Proto-Germanic *in ‘into’

English in-

Proto-Indo-European *werǵ- ‘to make’

…

Ancient Greek ἐνεργός ‘active’

Ancient Greek ἐνεργέω ‘to be active’

Ancient Greek ἐνεργητικός ‘Able to act on’

New Latin energeticus

Today it means

adj Having no energy; sluggish.

Language periods are conventional ranges, not dates for this word.

Etymograph / inergetic