petty

petty /ˈpɛti/ adjective
pettier; pettiest
petty
/ˈpɛti/
adjective
pettier; pettiest
Britannica Dictionary definition of PETTY
[also more petty; most petty]
1 
a  : not very important or serious
b  : relating to things that are not very important or serious
c  : committing crimes that are not very serious
2 
: treating people harshly and unfairly because of things that are not very important

— pettiness

/ˈpɛtinəs/ noun [noncount]