'ponderous' originates from Latin, specifically the word 'ponderosus,' where 'ponder-' meant 'weight.'

'ponderosus' transformed into the Old French word 'ponderous,' and eventually became the modern English word 'ponderous' through Middle English.

Initially, it meant 'having great weight,' but over time it evolved into its current meanings of 'slow and clumsy' and 'dull or laborious.'