'pouty' originates from the word 'pout', which comes from Middle English 'pouten', meaning 'to push out the lips'.

'pouten' transformed into the modern English word 'pout', and 'pouty' was derived from it to describe a characteristic of having a pout.

Initially, it meant 'to push out the lips', but over time it evolved into its current meaning of 'having a sulky expression'.