Definition of “prickly” - Learner’s Dictionary

prickly

adjective uk us /ˈprɪkli/
SHARP

covered with prickles:

a prickly bush
UNFRIENDLY informal

A prickly person or relationship is unfriendly or difficult to deal with:

She gets very prickly if you ask her questions about her private life.

(Definition of “prickly” from the Cambridge Learner's Dictionary © Cambridge University Press)