In Buddhism dukkha (Pali = suffering, ill, evil, unsatisfactory) is sorrow arising from bondage to maya. As the first of the Four Noble Truths, dukkha includes physical and mental suffering.
Happiness is also regarded as dukkha because of its impermanence. For Buddhists, the inevitable loss of worldly happiness begets unhappiness.
By way of contrast, most Buddhists would argue that the allegedly ‘supreme bliss’ attained from Nirvana is permanent.
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Thank you for the clear, concise definitions combined with the excellent selection of links :-).
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