Foolishly light or frivolous; governed by wild or thoughtless impulses; manifesting exuberant spirits or levity; flighty; heedless.Characterized by or indicating giddiness or levity of feeling.Affected with vertigo, or a swimming sensation in the head, causing liability to reel or fall; dizzy; reeling: as, to be giddy from fever or drunkenness, or in looking down from a great height.Adapted to cause or to suggest giddiness; of a dizzy or dizzying nature; acting or causing to act giddily.= Syn. 1 and 2. Careless, reckless, headlong, flighty, hare-brained, light-headed.To make dizzy or unsteady.To turn quickly; reel.