(1):

(superl.) Promoting or inducing giddiness; as, a giddy height; a giddy precipice.

(2):

(superl.) 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.

(3):

(superl.) Bewildering on account of rapid turning; running round with celerity; gyratory; whirling.

(4):

(superl.) Characterized by inconstancy; unstable; changeable; fickle; wild; thoughtless; heedless.

(5):

(v. i.) To reel; to whirl.

(6):

(v. t.) To make dizzy or unsteady.