The quality or state of being goosish; the characteristic of behaving in a silly, foolish, or goose-like manner.
From 'goosish' + '-ness' suffix (creating abstract nouns from adjectives). '-ness' is one of the most common noun-forming suffixes in English, dating back to Old English.
English has this amazing ability to convert almost any quality into a noun by adding '-ness'—'goosishness' transforms a behavior into a concept you can talk about, blame, or find amusing as if it were a tangible thing!
Complete word intelligence in one call. Free tier — 50 lookups/day.