Noun | 1. | ![]() idea, thought - the content of cognition; the main thing you are thinking about; "it was not a good idea"; "the thought never entered my mind" fallacy, false belief - a misconception resulting from incorrect reasoning erroneous belief, error - a misconception resulting from incorrect information self-deceit, self-deception - a misconception that is favorable to the person who holds it misapprehension, mistake, misunderstanding - an understanding of something that is not correct; "he wasn't going to admit his mistake"; "make no mistake about his intentions"; "there must be some misunderstanding--I don't have a sister" fancy, phantasy, illusion, fantasy - something many people believe that is false; "they have the illusion that I am very wealthy" delusion, hallucination - a mistaken or unfounded opinion or idea; "he has delusions of competence"; "his dreams of vast wealth are a hallucination" mirage - something illusory and unattainable unsoundness - a misconception that is fallacious and not true or valid; "the unsoundness of his conclusion was obvious" concept, conception, construct - an abstract or general idea inferred or derived from specific instances |