'unadorned' originates from the prefix 'un-' meaning 'not' and the word 'adorn,' which comes from Latin 'adornare,' meaning 'to decorate.'

'adornare' transformed into the Old French word 'aorner,' and eventually became the modern English word 'adorn' through Middle English.

Initially, it meant 'to decorate or embellish,' and this meaning has largely remained the same in modern usage.