'herculean' originates from Latin, specifically the word 'Herculeus,' where 'Hercules' referred to the mythological hero known for his strength.

'Herculeus' transformed into the Old French word 'herculien,' and eventually became the modern English word 'herculean' through Middle English.

Initially, it meant 'pertaining to Hercules,' but over time it evolved into its current meaning of 'requiring great strength or effort.'