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From The Collaborative International Dictionary of English v.0.48:
Giddy \Gid"dy\, a. [Compar. Giddier; superl. Giddiest.] [OE. gidi mad, silly, AS. gidig, of unknown origin, cf. Norw. gidda to shake, tremble.] [1913 Webster] 1. Having in the head a sensation of whirling or reeling about; having lost the power of preserving the balance of the body, and therefore wavering and inclined to fall; lightheaded; dizzy. [1913 Webster] By giddy head and staggering legs betrayed. --Tate. [1913 Webster] 2. Promoting or inducing giddiness; as, a giddy height; a giddy precipice. --Prior. [1913 Webster] Upon the giddy footing of the hatches. --Shak. [1913 Webster] 3. Bewildering on account of rapid turning; running round with celerity; gyratory; whirling. [1913 Webster] The giddy motion of the whirling mill. --Pope. [1913 Webster] 4. Characterized by inconstancy; unstable; changeable; fickle; wild; thoughtless; heedless. "Giddy, foolish hours." --Rowe. "Giddy chance." --Dryden. [1913 Webster] Young heads are giddy and young hearts are warm. --Cowper. [1913 Webster]