Pronunciation: (in-sen'si-tiv),[key] —adj. 1. deficient in human sensibility, acuteness of feeling, or consideration; unfeeling; callous: an insensitive person. 2. not physically sensitive: insensitive skin. 3. not affected by physical or chemical agencies or influences: insensitive to light. 4. not readily responsive or aware: insensitive to the needs of the peasants.