'unfashionable' originates from the prefix 'un-' meaning 'not' and the word 'fashionable', which comes from the Latin 'factionem', meaning 'a making or doing'.

'fashionable' evolved from the Middle English word 'facioun', which was derived from the Old French 'facion', and eventually became the modern English word 'fashionable'.

Initially, 'fashionable' meant 'pertaining to making or doing', but over time it evolved into its current meaning of 'in accordance with current fashion or style'.