An interminable discussion is
Interminable: Endless or apparently endless (often used hyperbolically)
An unimpeachable witness
Unimpeachable: Not able to be doubted, questioned, or criticized; entirely trustworthy.
A sybarite person will always
Sybarite: A person who is self-indulgent in their fondness for sensuous luxury.
A grisly story is
Grisly: Causing horror or disgust.
A fiasco is
Fiasco: A complete failure, especially a ludicrous or humiliating one.
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