The quality or state of being full of gladness; deep or abundant joy.
From 'gladful' plus '-ness' suffix creating an abstract noun; represents the fullest expression of the gladness concept.
English's ability to stack suffixes ('glad-ful-ness') means we can express nuanced emotional states—'gladfulness' is different from 'gladness' because it emphasizes the *abundance* and *overflow* of joy.
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