noun
a Spanish-American half-real piece formerly in use in parts of the southern United States
adjective
of little value or significance; petty or trifling
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The committee spent hours discussing picayune details of the budget proposal.
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Why are you getting so worked up over such a picayune issue?
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Stop being so picayune about it, it's not a big deal.
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Her picayune attitude towards life's challenges held her back from achieving her goals.