'unsupportive' originates from the prefix 'un-' meaning 'not' and the word 'supportive', which comes from the Latin 'supportare', where 'sub-' meant 'from below' and 'portare' meant 'to carry'.

'supportare' transformed into the Old French word 'supporter', and eventually became the modern English word 'support'. The prefix 'un-' was added to form 'unsupportive'.

Initially, 'support' meant 'to carry from below', but over time it evolved into its current meaning of 'providing assistance or encouragement'.