'leisurely' originates from Middle English, specifically the word 'leiserly,' where 'leiser' meant 'free time.' 'Assembled' comes from Old French 'assembler,' meaning 'to bring together.'

'leiserly' transformed into the modern English word 'leisurely,' and 'assembler' evolved into 'assembled' in modern English.

Initially, 'leisurely' meant 'having free time,' but over time it evolved to mean 'done in a relaxed manner.' 'Assembled' has largely retained its original meaning of 'put together.'