The quality or state of being silly, eccentric, or lightheaded.
From 'daffy' (silly, giddy) + noun suffix '-ness', which turns adjectives into abstract nouns describing qualities or conditions.
The '-ness' suffix is one of English's most productive word-building tools—you can add it to almost any adjective to make a noun, and 'daffiness' perfectly captures that scattered, giggly energy that's hard to describe in just one word.
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