Meaning
Enjoyment, good times, and pleasant vibes — the whole feeling of things being sweet and happy. 'Pure niceness' means nothing but good feelings and fun, a party, a gathering, or a day that is all warmth and pleasure. Built plainly from 'nice', the word names not a small politeness but a rich, shared atmosphere of enjoyment, and to be 'inna di niceness' is to be caught up in a good time with good company.
Examples
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Di party did pure niceness.
The party was nothing but good times.
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Wi a keep it niceness today.
We're keeping it all good vibes today.
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Come enjoy di niceness.
Come enjoy the good times.
Origin
From English 'nice' plus '-ness', but used in Jamaican as a warm noun for enjoyment and good vibes rather than mere pleasantness.
How it’s used
Wholly positive — the good-vibes opposite of 'mix-up' and 'bangarang'. 'Pure niceness' is a common way to praise a good time.