Synonyms for «grave mistake»

The phrase "grave mistake" means a very serious and significant error or wrongdoing. Full definition

Similar and related words and phrases are presented below.

Many students make grave mistakes if once being pregnant. (custom-essay-writing-service.org)
Having said this, many of us commit grave mistakes when buying and continuing a health insurance cover. (policybazaar.com)
It is a very grave mistake particularly as it is a completely unnecessary declaration of intent at this stage. (politicshome.com)
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