'unbroadcast' originates from the prefix 'un-' meaning 'not' and the word 'broadcast', which comes from the Middle English 'brodcaste', where 'broad' meant 'wide' and 'cast' meant 'to throw'.

'broadcast' changed from the Middle English word 'brodcaste' and eventually became the modern English word 'broadcast'.

Initially, 'broadcast' meant 'to scatter seeds widely', but over time it evolved into its current meaning of 'transmitting information via radio or television'.