Synonyms of 'misbelief'
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A delusion is a false idea.
I was under the delusion that he intended to marry me.
An error is something you have done which is considered to be incorrect or wrong, or which should not have been done.
NASA discovered a mathematical error in its calculations.
A fallacy is an idea which many people believe to be true, but which is in fact false because it is based on incorrect information or reasoning.
This is the biggest fallacy of all.
Thesaurus for misbelief from the Collins English Thesaurus
a false or unorthodox belief