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noun ADJ. dangerous | foolish I thought the whole idea was just a foolish and dangerous delusion. | paranoid VERB + DELUSION get, have, suffer (from) The psychiatrist said she was suffering from paranoid delusions. PREP. under a/the ~ He seemed to be under the delusion that he would make his fortune within a few years. | ~ about He had no delusions about his feelings for Kate. | ~ of She had delusions of persecution. PHRASES delusions of grandeur (= a belief that you are more important than you actually are) Don't go getting delusions of grandeur.
Oxford Collocations Dictionary