Hand Waving Definition

noun
Insubstantial words or actions intended to convince or impress.
Resorted to hand waving instead of arguing rationally.
American Heritage

(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.
Wiktionary
Alternative spelling of hand waving.
Wiktionary

Other Word Forms of Hand Waving

Noun

Singular:
hand waving
Plural:
hand wavings

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hand waving