hand waving

insubstantial words, arguments, gestures, or actions used in an attempt to explain or persuade.
Also, hand-waving, handwaving [hand-wey-ving] .
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  hand-waving
Part of Speech:  n
Definition:  a hand signal that one does not want to give a full explanation; also, an argument that is not fully supported or fully convincing
Usage:  informal
Dictionary.com's 21st Century Lexicon
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