adjective (a)

• making or willing to make concessions(adj.all)

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

  source: wordnet30
• intended to placate(adj.all)

  Example:
  A conciliatory visit.
  

  Synonym:
  conciliative
  Antonym:
  antagonistic
  

  source: wordnet30
• Tending to conciliate; pacific; mollifying; propitiating.(adjective)

  source: webster1913