The act of being particular or fussy about details; (adjective) characterized by excessive fussiness or concern with trivial matters.
From finick plus -ing suffix forming the present participle/gerund and used as an adjective. This describes the ongoing action or a characteristic marked by excessive concern with details.
The term 'finicking' perfectly describes what engineers and architects must do—their 'finicking' attention to measurements and specifications keeps buildings from collapsing, so what seems like annoying fussiness is actually what separates good design from disasters!
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