conciliatory

adjectives

making or willing to make concessions
"loneliness tore through him...whenever he thought of...even the compromising Louis du Tillet"
compromising, conciliatory, flexible
is derived from
conciliate
intended to placate
"spoke in a conciliating tone"; "a conciliatory visit"
conciliative, conciliatory
is derived from
conciliate
antonym
antagonistic