Learner's definition of SENSITIVE
[more sensitive; most sensitive]
1 a : easily upset by the things that people think or say about you
— often + about b : likely to cause people to become upset
a moody, sensitive teenager
He acts like a tough guy, but he's really very sensitive to criticism.
2 a : aware of and understanding the feelings of other people — often + to b : having an understanding of something : aware of something — + to 3 : easily affected by something in a way that is not pleasant or good : reacting to something in, on, or around you in a bad way — often + to
She is sensitive to pollen (in the air).
My teeth are sensitive to cold foods.
I am sensitive to wheat. [=I become ill when I eat wheat]
Now that I'm older, I'm more sensitive to (the) cold. [=I feel colder in cold surroundings now than I did in the past]
4 : able to express thoughts and feelings through writing, music, dance, etc.
5 a : able to sense very small changes in something b : changing in response to something 6 : needing to be handled in a careful or secret way in order to protect someone or something