IPA: /kəmˈpleɪsənt/
KK: /kəmˈpleɪsənt/
Showing a willingness to please others and be agreeable.
She was always complaisant, eager to help her friends with anything they needed.
Complaisant → It is formed from "com-" (meaning together) and "plaisant" (from Old French *plaisant*, meaning pleasing or agreeable). The word describes someone who is inclined to please others or is agreeable in nature.
Think of someone who is 'together' ('com-') with others in being 'pleasing' ('plaisant') — that's why complaisant means someone who is eager to please.