English
energyless
From energy + -less.
Formed from energy + -less
Proto-Indo-European *werǵ- ‘to make’
…
Ancient Greek ἐνεργός ‘active’
Ancient Greek ἐνέργεια ‘activity’
Late Latin energia
Middle French énergie
English energy
Today it means
adj Without energy.
Language periods are conventional ranges, not dates for this word.
Etymograph / energyless