'energetic' originates from Greek, specifically the word 'energetikos,' where 'energeia' meant 'activity' or 'operation.'

'energetikos' transformed into the Latin word 'energeticus,' and eventually became the modern English word 'energetic' through Middle English.

Initially, it meant 'pertaining to activity or operation,' but over time it evolved into its current meaning of 'having or showing a lot of energy.'