The term SEVERE, AS PAIN can be described by two crossword solutions: ACUTE (5 letters) and CRIPPLING (9 letters). ACUTE pain is a sharp, sudden pain that is usually short-lived. It is often caused by an injury or illness and can range from mild to severe. Crippling pain is a more intense and long-lasting type of pain that can be debilitating and interfere with daily activities. It is often caused by chronic conditions such as arthritis, fibromyalgia, or nerve damage.