petty
(often derogatory) Having little or no importance.
(often derogatory) Of persons or their behavior: marked by or reflective of undesirably limited interests, sympathies, or views; begrudging, selfish, small-minded; also, preoccupied with subjects having little or no importance and not mindful of broader concerns.
(often derogatory, informal) Inclined to cause frustration or annoyance to others out of spite over minor grievances; extremely vindictive.
(historical) Of or relating to the lowest grade or level of school; junior, primary.
(obsolete) Little or small in size.
(obsolete) Secondary in importance or rank; minor, subordinate.
(dialectal, euphemistic, informal) An outbuilding used as a lavatory; an outhouse, a privy.
(historical) A class or school for young schoolboys.
(obsolete, also figuratively) A little schoolboy, either in grade or size.