Be delirious refers to a state of mental confusion and disturbance which may cause a person's thoughts and actions to become irrational and unclear. There are several synonyms for the term, including being disoriented, confused, dazed, or bewildered. Delirious emotions may also be described as ecstatic, euphoric, or frenzied. People who suffer from fever, illness, or exhaustion are prone to delirium. In medical settings, coma, seizure, or hallucination can also induce delirious symptoms in the patients. Some additional synonyms of the term for other contexts might include hazy, frazzled, rattled, unbalanced, or hysterical. Delirium can have serious consequences, so it's important to seek medical attention if you notice its symptoms.