'unnoted' originates from the prefix 'un-' meaning 'not' and the word 'noted' from Latin 'notare' meaning 'to mark or note'.

'notare' transformed into the Old French word 'noter', and eventually became the modern English word 'note', with 'un-' added to form 'unnoted'.

Initially, it meant 'not marked or noted', and this meaning has largely remained the same in modern usage.