hand-waving
noun
hand-wav·ing ˈhan(d)-ˌwā-viŋ
variants or less commonly handwaving or hand waving
1
: movement with the hand or hands made as a signal to another
Over the last decade, the frenzied screaming and hand-waving on exchange trading floors has started to go the way of the horse and buggy.—
Gail Marks Jarvis
The woman and I cobbled together a lingua franca through hand-waving and the bits of Mandarin and Cantonese we both could understand.—
Madelyne Xiao
2
: insubstantial and unsupported or ineffective statements, arguments, actions, etc., especially when intended to distract or mislead
—often used before another noun
In many respects, his essay is the quintessence of the form, a frustrating exercise in bland soul-searching, misdirection, and hand-waving.—
Laura Miller
If this explanation seems a bit like hand waving, it is. Many of the details have not been worked out.—
Don Lincoln
… we never, ever take concrete steps to solve our problems, no matter how much handwaving we do.—
Matthew Dessem
a hand-waving theory/explanation/argument
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Merriam-Webster unabridged



