Meaning
Stupidity, nonsense, or silly behaviour — 'stupidness' (often softened to 'chupidness'). 'Stop di stupidness' tells someone to quit their foolish carrying-on. It covers everything from genuine dim-wittedness to time-wasting nonsense to annoying antics, and is a constant everyday word for anything foolish or exasperating.
Examples
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Stop di stupidness an behave.
Stop the nonsense and behave.
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A pure stupidness him a talk.
He's talking pure nonsense.
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Mi nuh have time fi dat chupidness.
I don't have time for that foolishness.
Origin
From 'stupid' + '-ness' (softened to 'chupid'); stupidity/nonsense. See [[foolishness]], [[mumu]].
How it’s used
Stupidity/nonsense/silly behaviour; 'chupidness' is the softer form. See [[foolishness]], [[duncehead]].