Bell comes from the Latin word meaning "war." Bellona was the little-known Roman goddess of war; her husband, Mars, was the god of war. 「ふーん。Bellonaはローマ神話の戦争の女神か~」と思って、さらに進むと、 antebellum (戦前の、特に南北戦争以前の)
Complaisant comes from Latin by way of French. It is easily confused with complacent, a related adjective that comes directly from Latin and has the meaning "self-satisfied" or "unconcerned." Someone who readily goes along with what you want to do is complaisant. Someone who doesn't care about what you want to do may be complacent.
complacent 【1】(通例,否定的意味合いで)(現状に)満足して,のうのうとして;悦に入って,自己満足の: His job doesn't challenge him, but he's too complacent to look for a new one. 仕事はやりがいのあるものではないが,そんなことには無頓着(むとんじゃく)で新しい仕事を探す気などさらさらない. 【2】気持ち[愛想]のいい: less complacent people あまり愛想のよくない人々. 【3】(…に)無頓着(むとんじゃく)な*about**. [1660.<ラテン語 complacens(complacere「気に入る,喜ばせる」の現在分詞)] com・pla・cent・ly