The quality or state of being gullish; a tendency to be somewhat foolish or easily deceived.
From 'gullish' plus the noun-forming suffix '-ness.' Creates an abstract noun expressing the quality described by the adjective.
The '-ness' suffix is the ultimate English tool for turning feelings into measurable properties—'sadness,' 'happiness,' 'gullishness'—as if character flaws are physical substances we can measure!
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