adjective

1. of the senses or sensation; esp., connected with the reception or transmission of sense impressions; sensory
2. receiving and responding to stimuli from outside objects or agencies; having sensation
3. responding or feeling readily and acutely; very keenly susceptible to stimuli a sensitive ear
4. easily hurt; tender; raw
5. having or showing keen sensibilities; highly perceptive or responsive intellectually, aesthetically, etc.
6. easily offended, disturbed, shocked, irritated, etc., as by the actions of others; touchy
7. changing readily in the presence of some external force or condition; specif.,
   1. readily affected by light: said of photographic film, etc.
   2. readily receiving very weak radio signals
   3. operating readily in weak light, as certain television camera tubes
8. designed to indicate or measure small changes or differences
9. showing, or liable to show, unusual variation; fluctuating a sensitive stock market
10. ☆ designating, of, or dealing with secret or delicate matters, esp. secret or delicate government matters

Etymology: ME sensitife < MFr sensitif < ML sensitivus < L sensus: see sense

noun