Hand-waving definitions

Insubstantial words or actions intended to convince or impress.

Resorted to hand waving instead of arguing rationally.

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

The sales pitch sounded good, but there was a lot of hand waving about the price.

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Alternative spelling of hand waving.
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