'unabashed' originates from Middle English, specifically the word 'abashen,' where 'a-' meant 'to' and 'bash' meant 'to be ashamed.'

'abashen' transformed into the modern English word 'unabashed' by adding the prefix 'un-' to indicate the opposite meaning.

Initially, it meant 'not to be ashamed,' and this meaning has largely remained the same in modern usage.