"knuckleheadery" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "knucklehead",
        "3": "ery"
      },
      "expansion": "knucklehead + -ery",
      "name": "suffix"
    }
  ],
  "etymology_text": "knucklehead + -ery",
  "head_templates": [
    {
      "args": {
        "1": "-"
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      "expansion": "knuckleheadery (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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        {
          "kind": "other",
          "name": "English terms suffixed with -ery",
          "parents": [],
          "source": "w"
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      ],
      "examples": [
        {
          "ref": "2013, Radley Balko, Rise of the Warrior Cop: The Militarization of America's Police Forces",
          "text": "[…] his own tone and rhetoric might have been part of the reason for the outbreak of knuckleheadery and half-cockedness in the first place.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The stupid behaviour of a knucklehead."
      ],
      "id": "en-knuckleheadery-en-noun-lFkJyRgG",
      "links": [
        [
          "stupid",
          "stupid"
        ],
        [
          "knucklehead",
          "knucklehead"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "knuckleheadery"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "knucklehead",
        "3": "ery"
      },
      "expansion": "knucklehead + -ery",
      "name": "suffix"
    }
  ],
  "etymology_text": "knucklehead + -ery",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "knuckleheadery (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms suffixed with -ery",
        "English terms with quotations",
        "English uncountable nouns"
      ],
      "examples": [
        {
          "ref": "2013, Radley Balko, Rise of the Warrior Cop: The Militarization of America's Police Forces",
          "text": "[…] his own tone and rhetoric might have been part of the reason for the outbreak of knuckleheadery and half-cockedness in the first place.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The stupid behaviour of a knucklehead."
      ],
      "links": [
        [
          "stupid",
          "stupid"
        ],
        [
          "knucklehead",
          "knucklehead"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "knuckleheadery"
}