Irritable /(?)/

Ir·ri·ta·ble

Irritable

a.
  1. Capable of being irritated.
  2. Very susceptible of anger or passion; easily inflamed or exasperated; as, an irritable temper.
    Vicious, old, and irritable.
  3. Endowed with irritability; susceptible of irritation; capable of being excited to action by the application of certain stimuli. (Physiol.)
  4. Susceptible of irritation; unduly sensitive to irritants or stimuli. See Irritation, n., 3. (Med.)