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n. The quality or state of being irritable; testiness or petulance.

n. Pathology Abnormal or excessive sensitivity of a body organ or part to a stimulus.

n. Physiology The capacity to respond to stimuli.

n. The state or quality of being irritable; quick excitability; petulance; fretfulness; as, irritability of temper.

n. A natural susceptibility, characteristic of all living organisms, tissues, and cells, to the influence of certain stimuli, response being manifested in a variety of ways.

n. A condition of morbid excitability of an organ or part of the body; undue susceptibility to the influence of stimuli.

n. The state or quality of being irritable; quick excitability; petulance; fretfulness.

n. A natural susceptibility, characteristic of all living organisms, tissues, and cells, to the influence of certain stimuli, response being manifested in a variety of ways, -- as that quality in plants by which they exhibit motion under suitable stimulation; esp., the property which living muscle possesses, of responding either to a direct stimulus of its substance, or to the stimulating influence of its nerve fibers, the response being indicated by a change of form, or contraction; contractility.

n. A condition of morbid excitability of an organ or part of the body; undue susceptibility to the influence of stimuli. See Irritation, n., 3.

n. The quality of being irritable; an irritable state or condition of the mind; proneness to mental irritation; irascibility; petulance: as, irritability of temper.

n. In physiology, the property of nerve, muscle, or other active tissue of reacting upon stimuli; in muscles, specifically, the property of contracting when stimulated.

n. In botany, that endowment of a vegetable organism by virtue of which a motion takes place in it in response to an external stimulus.

n. In pathology, morbid responsiveness to stimuli.

n. an irritable petulant feeling

n. excessive sensitivity of an organ or body part

n. a disposition to exhibit uncontrolled anger

"I am so tired I can hardly keep my eyes open, and the irritability is astounding."

reactivity    responsiveness   

chemical irritability   

irritation   

petulance    fretfulness    contractility   

ability    acceptability    adaptability    admissibility    affordability    agility    amiability    applicability    availability    capability   

restlessness    irritation    unrest    impatience    sensitiveness    excitability    drowsiness    insomnia    dizziness    despondency