'energetically' originates from the Greek word 'energeia,' where 'en-' meant 'in' and 'ergon' meant 'work.'

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

Initially, it meant 'in work or action,' but over time it evolved into its current meaning of 'showing great activity or vitality.'