Capable of perceiving with a sense or senses. Responsive to external conditions or stimulation. Susceptible to the attitudes, feelings, or circumstances of others. Quick to take offense; touchy. Easily irritated: sensitive skin. Readily altered by the action of an agent: film that is sensitive to light. Registering very slight differences or changes of condition. Used of an instrument. Fluctuating or tending to fluctuate, as in price: sensitive stocks. Of or relating to classified information: sensitive defense data; holds a sensitive position in the State Department. A sensitive person. One held to be endowed with psychic or occult powers.