'unnotched' originates from the prefix 'un-' meaning 'not' and the word 'notched' which comes from Middle English 'nocche', meaning 'a small cut or indentation'.

'nocche' transformed into the modern English word 'notch', and with the addition of the prefix 'un-', it became 'unnotched'.

Initially, 'notch' meant 'a small cut or indentation', and 'unnotched' has consistently meant 'not having a notch'.