The state or quality of being finicking; the act or habit of being overly particular or fussy about details.
From finicking (gerund/present participle) plus -ness suffix. This creates an abstract noun from the gerund form, representing both the action and the resulting quality.
English allows us to make nouns from gerunds by adding -ness, which is why 'finickingness' is technically correct even though it sounds awkward—the language values precision over elegance, giving us multiple ways to express the same concept!
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