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Fuddy-duddy (or fuddy duddy or fuddy-dud) is a word used to refer to a person who is fussy while old-fashioned, traditionalist, conformist, or conservative, sometimes almost to the point of eccentricity or geekiness.
Given that, in modern usage, giddy describes someone silly and frivolous, it's interesting to know that the Old English source for this word has a slightly darker tinge: gidig means insane or god-possessed..