Dukkha (Pali; Sanskrit duḥkha) is a term found in
ancient Indian literature, wherein states Monier-Williams, it means
anything that is "uneasy, uncomfortable, unpleasant, difficult,
causing pain or sadness".
It also refers to a concept in Indian religions about the nature of
life that innately includes the "unpleasant", "suffering,"
"pain," "sorrow", "distress", "grief"
or "misery."
The term Dukkha does not have a one word English translation,
and embodies diverse aspects of unpleasant human experiences.
It is opposed to the word sukha,
meaning "happiness," "comfort" or "ease."