insubstantial words, arguments, gestures, or actions used in an attempt to explain or persuade.
Also hand-wav·ing, hand·wav·ing [hand-wey-ving] /ˈhændˌweɪ vɪŋ/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for hand-waving
Historical Examples of hand-waving
The houses beneath him seemed companionable; friendly were the hand-waving crowds, and factory-whistles gave him raucous greeting.The Trail of the Hawk