The quality or state of being full of bright, vivid colors or interesting details.
From 'colourful' (adjective) + '-ness' (noun suffix that creates abstract nouns). The suffix '-ness' has Germanic roots and turns adjectives into countable abstractions of their qualities.
The '-ness' suffix is one of the most productive word-making tools in English, having existed since Old English times—it's so useful that we keep adding it to new adjectives (like 'randomness' or 'awkwardness'), making it a living, breathing part of how English creates vocabulary.
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