Hand-waving
noun
1.
insubstantial words, arguments, gestures, or actions used in an attempt to explain or persuade.
noun
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 Note
informal
noun
A signal that one does not want to give a full explanation; also, an argument that is not fully supported or fully convincing: They asked him about progress, but he just offered some hand-waving. / She tried to explain why she forgot, but the hand-waving said it all
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