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.-promoting or inducing giddiness; as, a giddy height; a giddy precipice.-bewildering on account of rapid turning; running round with celerity; gyratory; whirling.-characterized by inconstancy; unstable; changeable; fickle; wild; thoughtless; heedless.-to reel; to whirl.-to make dizzy or unsteady.