Meanings
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1
adj
Of little consequence; small and of little importance; petty, trivial.
It's also representative of a psychological syndrome that I notice has gotten steadily worse as the Cruise wears on, a mental list of dissatisfactions and grievances that started picayune but has quickly become nearly despair-grade.
Thesaurus
Etymology
The noun is borrowed from southern French picaillon, pécaillon, picayon (“type of small foreign coin; (informal, especially in the plural) cash, money”), and from its etymon Occitan picalhon, picaioun (“cheaply made Savoyan-Piedmontese coin that was rapidly demonetized; (by extension) cash, money”), probably from Occitan piquar (“to ring (bells); to knock, strike”) (referring to the clinking of coins in a pocket), originally imitative. The adjective is derived from the noun.