say it: pik-ee-YOON
picayune is an adjective meaning "(informal) small and of little importance". It carries one recorded sense.
(informal) small and of little importance
“a fiddling sum of money”
“a footling gesture”
“our worries are lilliputian compared with those of countries that are at war”
“a little (or small) matter”
“a dispute over niggling details”
“limited to petty enterprises”
“piffling efforts”
“giving a police officer a free meal may be against the law, but it seems to be a picayune infraction”
colloquialism
Definitions, synonyms and semantic relations for picayune come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.