Etymology

giddy

gid·dy
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Today it means: Feeling a sense of spinning in the head, causing a perception of unsteadiness and being about to fall down; dizzy. Full definition →

Middle English gidi ← Old English gidiġ ← Proto-West Germanic *gudīg
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The story

  1. Proto-West Germanic · inherited from*gudīg“ghostly, spirited”
  2. Old English · inherited fromgidiġ
  3. Middle English · inherited fromgidi
  4. English todaygiddy

The adjective is derived from Middle English gidi, gedy, gydy (“demonically controlled or possessed; crazy, insane; foolish, idiotic, ridiculous, unwise; unsure; (rare) dizzy, shaky; (rare) of an animal: crazed, out of control; a fool”) [and other forms], from Old English gidiġ, gydiġ (“possessed by a demon or spirit, insane, mad”), from Proto-West Germanic *gudīg (“ghostly, spirited”, literally “possessed by a god or spirit”), from *god (“god”) + *-ig, *-g (suffix forming adjectives with the senses of being, doing, or having). Thus the word's elements correspond to god + -y (suffix meaning ‘having the quality of’, forming adjectives). The noun and the verb are derived from the adjective.

Etymology from Wiktionary, CC BY-SA 4.0.