Capable of being irritated. / Easily exasperated or excited. / (medicine) Responsive to stimuli.

The quality of being irritable.

plural of irritableness

serving to excite or irritate / accompanied with, or produced by, increased action or irritation

Any substance causing irritation; an irritant.

The quality of being irritant or irritating. / (law, Scotland) The state or quality of being null and void; invalidity

One who or that which irritates.

plural of irritancy

plural of irritative

plural of irritability