hand waving

hand waving

noun
insubstantial words, arguments, gestures, or actions used in an attempt to explain or persuade.
Also, hand-wav·ing, hand·wav·ing [hand-wey-ving] .
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source Link To hand waving

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Hand waving is always a great word to know.
So is ninnyhammer. Does it mean:
a chattering or flighty, light-headed person.
a fool or simpleton; ninny.
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