她的演讲以简洁有力著称，每句话都切中要害。

Her speech was admired for its pithiness, with every sentence hitting the mark.

pithiness 是名词，由形容词 pithy（简洁有力的）加上名词后缀 -ness 构成。pithy 来自名词 pith（精髓、核心），所以 pithiness 表示"简洁有力、切中要害"的特点。