His natural suavity made everyone feel at ease in his presence.

suavity 是名词，来自形容词 suave（温文尔雅的、彬彬有礼的），加上名词后缀 -ity 构成。suave 源自拉丁语 suavis（甜美的、温和的）。suavity 指"温文尔雅的气质"或"优雅得体的举止"。