Meaning of “petty” - Learner’s Dictionary

petty

adjective uk us /ˈpeti/
UNIMPORTANT [ always before noun ]

unimportant or not serious:

petty details
petty crime
COMPLAINING [ never before noun ]

complaining too much about unimportant things:

You can be so petty sometimes!

(Definition of “petty” from the Cambridge Learner’s Dictionary © Cambridge University Press)