'unruffled' originates from the prefix 'un-' meaning 'not' and the word 'ruffle,' which comes from Middle English 'ruffelen,' meaning 'to disturb or wrinkle.'

'ruffelen' transformed into the modern English word 'ruffle,' and with the addition of the prefix 'un-,' it became 'unruffled.'

Initially, 'ruffle' meant 'to disturb or wrinkle,' and 'unruffled' evolved to mean 'not disturbed or calm.'