What are some synonyms for 'rare' or 'unusual' that have a negative connotation. For instance:
Enron's collapse was unusual, as the massive financial trickery ultimately bankrupted millions of investors.
What could replace 'unusual'?
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Catastrophic: While Enron's collapse was certainly bad, catastrophic might be a bit over-blown, depending on what point the writer is trying to make.
Ruinous and disastrous may be slightly weaker than catastrophic and devastating.
While all these possibilities do not explicitly mean "rare", I think most people understand that disastrous events are rare by their very nature.