Petty
/ˈpɛti/
noun
(usually in the plural) A little schoolboy, either in grade or size.
A class or school for young schoolboys.
An outhouse: an outbuilding used as a lavatory.
Synonyms: petty form, ABC, petty school
adjective
Little, small, secondary in rank or importance.
Insignificant, trifling, or inconsiderable.
“a petty fault”
Narrow-minded, small-minded.