👉 Unflexible is a medical term that refers to a condition in which the body's ability to stretch and contract, or to adapt to changes in its environment, is not sufficient for normal functioning. This can lead to a range of symptoms, including pain, stiffness, and difficulty with movement. Unflexibility may be caused by various factors, such as genetics, age, injury, or chronic illness. Treatment options for unflexible conditions include physical therapy, medication, and lifestyle changes.