Think of a verdict that cannot be appealed. Someone has been judged completely bad, the door has closed, and there is no way back. Every use of damnation borrows that closed door: the religious punishment that never ends, a judgment on a plan so total that nothing is left to argue, and the shout you let out when something has gone wrong and you reach for the heaviest word there is.
From the word’s history
Wiktionary traces the word from Middle English dampnacioun, from Old French dampnacion, from Latin damnatio. The Latin belongs with judging and sentencing, which is why the courtroom feeling sits inside every modern use.
維基詞典給的路線是：中古英語 dampnacioun，來自古法文 dampnacion，再往上是拉丁文 damnatio。拉丁文那一支跟「判罪、宣判」同源，所以這個字從頭到尾都帶著法庭的味道——有人被判了，而且判決定案。
Wiktionary (kaikki extract, etymology_text supplied in this packet: kaikki:3f6f69a190036ae4:635122423)
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