A deadly mistake and a mortal mistake

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A-friend

Senior Member
Persian (Farsi)
Hello everybody
I was wondering if you let me know whether it is possible in English to say metaphorically that a mistake was very bad in a manner that may cause many further consequences in the following ways:
- It was a deadly mistake.
- It was a mortal mistake.
For me they both work naturally especially the first one.
 
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