Merriam-Webster's Collegiate® Dictionary, 11th Edition
SENSITIVE
I. adjective
Etymology: Middle English, from Anglo-French, from Medieval Latin sensitivus, probably alteration of sensativus, from sensatus sensate
Date: 15th century
sensory 2,
2. receptive to sense impressions, capable of being stimulated or excited by external agents (as light, gravity, or contact) , highly responsive or susceptible: as, a. easily hurt or damaged, delicately aware of the attitudes and feelings of others, excessively or abnormally susceptible ; hypersensitive , readily fluctuating in price or demand , capable of indicating minute differences ; delicate , readily affected or changed by various agents (as light or mechanical shock) , highly radiosensitive,
4. concerned with highly classified government information or involving discretionary authority over important policy matters , calling for tact, care, or caution in treatment ; touchy , having or showing concern for a specified matter, see: liable sensitively adverb sensitiveness noun
II. noun
Date: 1838
a person having occult or psychical abilities, a sensitive person