'dissatisfy' originates from Latin, specifically the word 'satisfacere,' where 'dis-' meant 'apart' and 'satisfacere' meant 'to satisfy.'

'satisfacere' transformed into the Old French word 'satisfaire,' and eventually became the modern English word 'satisfy,' with 'dis-' added to form 'dissatisfy.'

Initially, it meant 'to not satisfy,' and this meaning has largely remained the same in modern usage.