'unaccommodating' originates from the prefix 'un-' meaning 'not' and the word 'accommodate', which comes from Latin 'accommodare', where 'ad-' meant 'to' and 'commodare' meant 'make fit'.

'accommodare' transformed into the Old French word 'acommoder', and eventually became the modern English word 'accommodate'. The prefix 'un-' was added to form 'unaccommodating'.

Initially, 'accommodate' meant 'to make fit or suitable', and 'unaccommodating' evolved to mean 'not willing to make fit or suitable for others'.