Delirium is a state of mental confusion and disorientation, often caused by an underlying medical condition. HALLUCINATION (13 letters) is a false perception of reality, such as seeing or hearing something that is not actually present. DEMENTIA (8 letters) is a decline in cognitive function, including memory, language, and problem-solving abilities. DERANGEMENT (11 letters) is a state of severe mental disorder. FERVOR (6 letters) is intense and passionate feeling. FUROR (5 letters) is a state of wild excitement or rage. ABERRATION (10 letters) is a deviation from what is normal or expected. LUNACY (6 letters) is a state of mental illness, especially when it is severe. INSANITY (8 letters) is a severe mental disorder that impairs one's ability to think rationally. FOOLISHNESS (11 letters) is the quality of being unwise or lacking good sense. ECSTASY (7 letters) is a state of intense happiness or joy. CRAZE (5 letters) is an intense and widely shared enthusiasm for something. MANIA (5 letters) is a state of frenzied or excited activity. FEVER (5 letters) is a high body temperature, usually caused by infection. FRENZY (6 letters) is a state of wild and uncontrolled emotion or behavior. HYSTERIA (8 letters) is a state of uncontrollable agitation or emotion.