无名怨愤（Ressentiment）是尼采著作中的一个关键概念。来自一个法语词汇，指经济上处于低水平的阶层对经济上处于高水平的阶层普遍抱有的一种积怨。或因自卑、压抑而引起的一种愤慨。

Resentment (also called ranklement or bitterness), not classified among Paul Ekman's six basic emotions of surprise, disgust, happiness, sadness, anger, and fear, is the foundation of hatred. Resentment comprises the three basic emotions of disgust, sadness and surprise -the perception of injustice. Resentment is a mixture of disappointment, anger, and fear. As the surprise of injustice becomes less frequent, so too does anger and fear fade -leaving disappointment as the predominant emotion. So, to the extent perceived disgust and sadness remain, so too does the level of disappointment remain.