hand waving

Definition

Discussion or argumentation involving approximation, vagueness, educated guessing, or the attempt to explain or excuse vagaries.

Example Sentences

• "The sales pitch sounded good, but there was a lot of hand waving about the price."
• "Protesters who demand that this brilliantly humane enterprise be stopped should have their motives questioned. Their protest is nothing but the mindless hand waving of Luddites."