picayune (n.)

1804, "coin of small value," in early use the Spanish half-real, a coin circulating in Louisiana, Florida, and adjacent regions, worth about 6 cents, later a 5 cent piece; probably from Louisiana French picaillon "coin worth 5 cents," earlier the French name of an old copper coin of Savoy (1750), from Provençal picaioun "small copper coin," from picaio "money," a word of uncertain origin. Adjectival figurative sense of "paltry, mean" recorded from 1813.

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Definitions of picayune

picayune (adj.)
(informal) small and of little importance;
giving a police officer a free meal may be against the law, but it seems to be a picayune infraction
Synonyms: fiddling / footling / lilliputian / little / niggling / piddling / piffling / petty / trivial