好词典
delusional
UK //dɪˈluː.ʒən.əl//US //dɪˈluː.ʒən.əl//
词源
源自拉丁语 'delusio'（欺骗）+ 后缀 '-al'，18世纪进入英语，原指‘欺骗性的’，后特指病理性妄想。
adjective
❶ 形容人持有与事实不符的坚定信念，通常由于精神疾病或极端固执导致，表现为无法被理性说服的妄想状态。
“The patient was clearly delusional, insisting that aliens controlled his thoughts.”
（这名患者显然有妄想症，坚称外星人控制了他的思想。）
“She became delusional after days without sleep, convinced her coworkers were spies.”
（她连续几天没睡觉后开始产生妄想，确信同事都是间谍。）
同义词:paranoid, fantastical, hallucinatory
常见短语
delusional disorder — 一种精神疾病，患者长期坚持与现实明显矛盾的错误信念，但其他认知功能相对正常。
“He was diagnosed with delusional disorder after years of accusing neighbors of poisoning his mail.”
（在多年指控邻居毒害他的邮件后，他被诊断为妄想障碍。）