de·lir·i·um noun 1. an acutely disturbed state of mind that occurs in fever, intoxication, and other disorders and is characterized by restlessness, illusions, and incoherence of thought and speech. lu·cid·i·ty noun 1. the quality of being easily understood, completely intelligible, or comprehensible 2. the ability to see things clearly; rationality; sanityAll Rights Reserved