noun
delusional idea
A technical term in psychiatry for a fixed false belief held despite evidence to the contrary. Not used in everyday conversation.
妄想着想は統合失調症の症状の一つです。
Delusional ideas are one of the symptoms of schizophrenia.
Compound of 妄想 (delusion) and 着想 (idea, conception). The exact historical derivation is uncertain; the term is used in modern psychiatric contexts.