delusion
B1CEFR level
25/100Rarity: fairly common
TechnicalRegister
A fixed false belief held with certainty despite clear evidence to the contrary and not shared by the person's culture.
He held a delusion that his neighbours were poisoning his water supply.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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