Dukkha

Duḥkha lit. "suffering", "pain", here "restlessness", "a sense of unease, dissatisfaction, or incompleteness", is an important concept in Buddhism, Jainism and Hinduism. Its meaning is context-dependent: it may refer more specifically to the "unsatisfactoriness" or "unease" of craving for and grasping after transient 'things', or expecting pleasure from them while ignorant of this transientness. In Buddhism, dukkha is part of the first of the Four Noble Truths and one of the three marks of existence. The term also appears in scriptures of Hinduism, such as the Upanishads, in discussions of moksha.