Her speech was full of exaggerated gestures and facial expressions, revealing obvious theatricality.

theatricality 是由名词 theatre（剧院、戏剧）加上形容词后缀 -ical（与...有关的）构成形容词 theatrical（戏剧的、夸张的），再加上名词后缀 -ity（表示性质或状态）构成的名词，意思是"戏剧性、夸张表演的特性"。