(predicative, _, only) Feeling a sense of spinning in the head, causing a perception of unsteadiness and being about to fall down; dizzy.
The man became giddy upon standing up so fast.
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(attributive) Causing or likely to cause dizziness or a feeling of unsteadiness.
Susan loved to drink wine, and I was not a drinker at all, so I'd just sit there and watch her drink glass after glass and get giddier and giddier.
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Moving around something or spinning rapidly.
They climbed to a giddy height.
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