"dead wrong" meaning in English

{
  "etymology_text": "From dead being used as an intensifier.",
  "forms": [
    {
      "form": "dead-wrong",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "deadwrong",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "dead wrong (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Icelandic translations",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              225,
              235
            ]
          ],
          "ref": "1986, Terry Pratchett, The Light Fantastic, published 2022, page 130:",
          "text": "He believed, against all experience, that the world was fundamentally understandable, and that if he could only equip himself with the right mental toolbox he could take the back off and see how it worked. He was, of course, dead wrong.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "utterly wrong."
      ],
      "id": "en-dead_wrong-en-adj-Kz0UtwsJ",
      "links": [
        [
          "utterly",
          "utterly"
        ]
      ],
      "tags": [
        "not-comparable"
      ],
      "translations": [
        {
          "code": "is",
          "lang": "Icelandic",
          "lang_code": "is",
          "sense": "emphatically wrong",
          "word": "kolrangur"
        }
      ]
    }
  ],
  "word": "dead wrong"
}

{
  "etymology_text": "From dead being used as an intensifier.",
  "forms": [
    {
      "form": "dead-wrong",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "deadwrong",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "dead wrong (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with quotations",
        "English uncomparable adjectives",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Icelandic translations"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              225,
              235
            ]
          ],
          "ref": "1986, Terry Pratchett, The Light Fantastic, published 2022, page 130:",
          "text": "He believed, against all experience, that the world was fundamentally understandable, and that if he could only equip himself with the right mental toolbox he could take the back off and see how it worked. He was, of course, dead wrong.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "utterly wrong."
      ],
      "links": [
        [
          "utterly",
          "utterly"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "translations": [
    {
      "code": "is",
      "lang": "Icelandic",
      "lang_code": "is",
      "sense": "emphatically wrong",
      "word": "kolrangur"
    }
  ],
  "word": "dead wrong"
}