'unflavored' originates from the prefix 'un-' meaning 'not' and the word 'flavored', which comes from the Old French 'flavorer', meaning 'to give taste to'.

'flavorer' transformed into the Middle English word 'flavour', and eventually became the modern English word 'flavor'.

Initially, 'flavor' meant 'to give taste to', and 'unflavored' evolved to mean 'not having any added taste'.