'underdone' originates from Middle English, specifically the word 'underdon,' where 'under-' meant 'not enough' and 'don' meant 'done or completed.'

'underdon' changed from Middle English word 'underdon' and eventually became the modern English word 'underdone'.

Initially, it meant 'not completed or insufficiently done,' but over time it evolved into its current meaning of 'not cooked thoroughly.'