delusionary

/dɪˈluːʒəˌnɛri/
adjective
  1. Relating to or characterized by a false belief or opinion that is held despite strong evidence against it.
    • She suffered from delusionary thoughts that everyone was plotting against her.
    • His delusionary belief that he could fly led him to jump off the roof.
    • The conspiracy theory was completely delusionary and had no basis in fact.
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