pettier
pet-ti-er
adjective
More concerned with trivial things or displaying small-mindedness; less important.
"Their argument became pettier over time."
Thesaurus
Synonyms: narrow, petty, narrow-minded, small-minded, piddling, trivial, little, fiddling, unimportant, footling, niggling, piffling
Antonyms: grand larceny, grand theft