adjective (a)

• not making concessions(adj.all)

  Example:
  Took an uncompromising stance in the peace talks.
  Uncompromising honesty.
  

  Synonym:
  inflexible, sturdy
  Antonym:
  compromising, conciliatory, flexible
  

  source: wordnet30
• Not admitting of compromise; making no truce or concessions; obstinate; unyielding; inflexible.(adjective)

  source: webster1913