D Word

One conception is of eternal suffering and denial of entrance to heaven, often described in the Bible as burning in fire. Another conception, derived from the scripture about Gehenna is simply that people will be discarded (burned), as being unworthy of preservation by their gods.
In Eastern Christian traditions (Eastern Orthodoxy and Oriental Orthodoxy), as well as some Western traditions, it is seen as a state of separation from God, a state into which all humans are born but against which Christ is the Mediator and "Great Physician".
The Church of Jesus Christ of Latter-day Saints sees damnation as a halt in progress rather than an eternal suffering.

It is likened to a dam in a river that prevents the river from flowing as it normally would.
Non-religious formal uses
Sometimes the word damned refers to condemnation by humans, for example:
A discussion guidefrom the California Council for the Humanities says "... The Grapes of Wrath was an immediate best-seller, widely praised and almost as widely damned throughout the country....".
The common journalese expression "a damning report".

Colloquialisms
"Damn" is a mildly profane word used in North America, the United Kingdom and Australia. But compare the expression "I don't give a tinker's cuss".
"God damn", or "Goddamn", is usually seen as far more profane, and even sacrilegious, than simply "damn", as it is basically an invocation for God to condemn something or someone to Hell.

In present-day radio or television broadcasts of North America, the word "God" is usually censored or blurred, leaving "damn" uncensored. "Damn, he/she is fine" or perhaps "Damn, he has a nice car!"."Hot damn" may be used similarly, but it is somewhat distinct; for example, if one says, "Joe just won the lottery," a response of "Damn!" on its own can indicate disapproval, but "Hot damn!" indicates approval or surprise.
"Damned" is also used as an adjective synonymous with "annoying" or "uncooperative," or as a means of giving emphasis. For example, "The damn(ed) furnace is not working again!" or, "I did wash the damn(ed) car!" or, "The damn(ed) dog won't stop barking!" (The word "damned" is usually only used in North America, whereas in other English speaking countries the word is simply "damn")
Etymology
Its Proto-Indo-European language origin is usually said to be a root dap-, which appears in Latin and Greek words meaning "feast" and "expense".

But there is a Vedic Sanskrit root dabh or dambh = "harm".
The word damnum did not have exclusively religious overtones. From it in English came "condemn"; "damnified" (an obsolete adjective meaning "damaged"); "damage" (via French from Latin damnaticum).