The quality or state of being somewhat fat or somewhat inclined to be fat.
From 'fattish' (adjective meaning somewhat fat) plus the noun-forming suffix '-ness', creating an abstract noun for this mildly fatty quality.
Stacking suffixes like this—'fat' + '-ish' + '-ness'—shows how English builds complexity through simple, repeatable layers, allowing speakers to express increasingly subtle shades of meaning.
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