intransigent
definition
refusing to change one's views or to agree about something
example
Despite the team's efforts to negotiate a compromise, the intransigent leader refused to consider any changes to the proposal.
synonyms
uncompromisinginflexibleobstinate
word origin — from Latin 'intransigēns', meaning 'non-compromising', from 'in-' (not) + 'transigere' (to come to an agreement)