"have no idea" meaning in English

{
  "forms": [
    {
      "form": "has no idea",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "having no idea",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "had no idea",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "had no idea",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "have<has,,had> no idea"
      },
      "expansion": "have no idea (third-person singular simple present has no idea, present participle having no idea, simple past and past participle had no idea)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "glosses": [
        "To not know at all."
      ],
      "id": "en-have_no_idea-en-verb-8cXAjVPC",
      "links": [
        [
          "know",
          "know"
        ]
      ],
      "translations": [
        {
          "_dis1": "61 39",
          "code": "cs",
          "lang": "Czech",
          "sense": "know not",
          "word": "nemít tušení"
        },
        {
          "_dis1": "61 39",
          "code": "nl",
          "lang": "Dutch",
          "sense": "know not",
          "word": "geen idee hebben"
        },
        {
          "_dis1": "61 39",
          "code": "ro",
          "lang": "Romanian",
          "sense": "know not",
          "word": "nu avea habar"
        }
      ]
    },
    {
      "categories": [
        {
          "_dis": "37 63",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "19 81",
          "kind": "other",
          "name": "English negative polarity items",
          "parents": [
            "Negative polarity items",
            "Terms by semantic function"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "31 69",
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "25 75",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "18 82",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "17 83",
          "kind": "other",
          "name": "Terms with Czech translations",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "25 75",
          "kind": "other",
          "name": "Terms with Dutch translations",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "17 83",
          "kind": "other",
          "name": "Terms with Romanian translations",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "2019, Abhijit V. Banerjee, Esther Duflo, Good Economics for Hard Times, page 236:",
          "text": "For both Margaret Thatcher in the UK and Ronald Reagan in the US, what was to blame for the slump in the late-1970s^([sic]) was clear (though we now know they really had no idea).",
          "type": "quote"
        }
      ],
      "glosses": [
        "To be mistaken; to not have a correct idea."
      ],
      "id": "en-have_no_idea-en-verb-wHPcdxie",
      "related": [
        {
          "_dis1": "5 95",
          "word": "I have no idea"
        }
      ]
    }
  ],
  "word": "have no idea"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English negative polarity items",
    "English verbs",
    "Entries with translation boxes",
    "Pages with 1 entry",
    "Pages with entries",
    "Terms with Czech translations",
    "Terms with Dutch translations",
    "Terms with Romanian translations"
  ],
  "forms": [
    {
      "form": "has no idea",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "having no idea",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "had no idea",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "had no idea",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "have<has,,had> no idea"
      },
      "expansion": "have no idea (third-person singular simple present has no idea, present participle having no idea, simple past and past participle had no idea)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "related": [
    {
      "word": "I have no idea"
    }
  ],
  "senses": [
    {
      "glosses": [
        "To not know at all."
      ],
      "links": [
        [
          "know",
          "know"
        ]
      ]
    },
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2019, Abhijit V. Banerjee, Esther Duflo, Good Economics for Hard Times, page 236:",
          "text": "For both Margaret Thatcher in the UK and Ronald Reagan in the US, what was to blame for the slump in the late-1970s^([sic]) was clear (though we now know they really had no idea).",
          "type": "quote"
        }
      ],
      "glosses": [
        "To be mistaken; to not have a correct idea."
      ]
    }
  ],
  "translations": [
    {
      "code": "cs",
      "lang": "Czech",
      "sense": "know not",
      "word": "nemít tušení"
    },
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "know not",
      "word": "geen idee hebben"
    },
    {
      "code": "ro",
      "lang": "Romanian",
      "sense": "know not",
      "word": "nu avea habar"
    }
  ],
  "word": "have no idea"
}