'unfurnished' originates from the prefix 'un-' meaning 'not' and the word 'furnished' from Old French 'furnir', meaning 'to supply'.

'furnir' transformed into the Middle English word 'furnishen', and eventually became the modern English word 'furnish'.

Initially, 'furnish' meant 'to supply or provide', and 'unfurnished' has retained the meaning of 'not supplied with furniture'.