adj capable of being irriated.
2. irritable ·adj susceptible of irritation; unduly sensitive to irritants or stimuli. ·see irritation, ·noun, 3.
3. irritable ·adj very susceptible of anger or passion; easily inflamed or exasperated; as, an irritable temper.
4. irritable ·adj endowed with irritability; susceptible of irritation; capable of being excited to action by the application of certain stimuli.