'uncompromising' originates from the prefix 'un-' meaning 'not' and the word 'compromise,' which comes from Latin 'compromissum,' meaning 'mutual promise.'

'compromissum' transformed into the Old French word 'compromis,' and eventually became the modern English word 'compromise,' with 'un-' added to form 'uncompromising.'

Initially, 'compromise' meant 'a mutual promise or agreement,' but 'uncompromising' evolved to mean 'not willing to make concessions.'