adjective
touchy
TUHCH-ee/ˈtʌtʃi/
Readily provoked into an adverse reaction.
My touchy colleague reacts defensively when I gently suggest a change.

Etymology
Touchy may be an alteration of tetchy, “easily irritated,” influenced by touch. That possible influence fits touch’s figurative sense “hurt someone’s feelings,” but the origin remains uncertain.
In context
very touchy, very annoyed to be asked about the Harborne donation.
More examples
- He's touchy about his age, so please don't joke about it.
- Money is a touchy subject in our family.
- She gets touchier when she hasn't had enough sleep.
Forms
touchy · touchier · touchiest
touchiness noun — A tendency to become upset or offended.