"hand-waving" meaning in English

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  "lang_code": "en",
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          "ref": "2011 June 17, Andrew Brown, “Minds, brains and woo”, in The Guardian",
          "text": "So when we're discussing thought and conscious processes, talking about minds is precise, and even measurable (what else do public opinion pollsters do?) while talking about brains is just hand-waving.",
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  "word": "hand-waving"
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      "form": "more hand-waving",
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      "form": "most hand-waving",
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        "superlative"
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        {
          "ref": "2001 January 15, Jeffrey Kluger, “Obesity”, in Time",
          "text": "For years much of this has been explained with hand-waving references to body types and metabolism—broadly accurate, but cold comfort to the estimated 61% of Americans who are overweight or obese and want to have their weight controlled, not merely explained.",
          "type": "quotation"
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        {
          "ref": "2018, Marcus Chown, Infinity in the Palm of Your Hand […], Michael O'Mara Books",
          "text": "You, me and everything in the universe are holograms. This may seem very vague and hand-waving. However, in 1998, the Argentinean-American physicist Juan Maldacena published a paper that shored up the idea that we live in a ‘holographic universe’ and set the world of physics alight.",
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  "word": "hand-waving"
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      "form": "more hand-waving",
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          "type": "quotation"
        },
        {
          "ref": "2018, Marcus Chown, Infinity in the Palm of Your Hand […], Michael O'Mara Books",
          "text": "You, me and everything in the universe are holograms. This may seem very vague and hand-waving. However, in 1998, the Argentinean-American physicist Juan Maldacena published a paper that shored up the idea that we live in a ‘holographic universe’ and set the world of physics alight.",
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        "present participle and gerund of hand-wave"
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