'leisurely' originates from Middle English, specifically the word 'leiserly,' where 'leiser' meant 'leisure.' 'Completed' originates from Latin, specifically the word 'completus,' where 'com-' meant 'together' and 'plere' meant 'to fill.'

'leiserly' transformed into the modern English word 'leisurely,' and 'completus' transformed into the modern English word 'completed' through Old French 'complet.'

Initially, 'leisurely' meant 'at one's own pace,' and 'completed' meant 'filled up or finished.' Over time, 'leisurely-completed' evolved to mean 'done in a relaxed and unhurried manner.'