The quality of being finicky; excessive fussiness or the tendency to be hard to please about small details.
From finicky (adjective) plus -ness suffix forming nouns expressing states or qualities. This is the standard way to create a noun from the common modern adjective form.
A toddler's 'finickiness' about food might seem like stubbornness, but research shows it's often 'neophobia'—a biological fear of new tastes that protected our ancestors from eating poisonous plants, which means your picky kid has ancient survival instincts!
Complete word intelligence in one call. Free tier — 50 lookups/day.