1. Sensibility, susceptibility, sensitiveness, sensitivity refer to capacity to respond to or be affected by something. Sensibility is, particularly, capacity to respond to aesthetic and emotional stimuli: the sensibility of the artist. Susceptibility is the state or quality of being impressionable and responsive, especially to emotional stimuli; in the plural it has much the same meaning as sensibility : a person of keen susceptibilities. Sensitiveness is the state or quality of being sensitive, of having a capacity of sensation and of responding to external stimuli: sensitiveness to light. Sensitivity is a special capability of being sensitive to physiological, chemical action or a tendency to be easily affected by the adverse reactions of others: the sensitivity of a nerve; sensitivity to criticism. 2. alertness, awareness.