"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": [
    {
      "categories": [
        {
          "_dis": "92 8",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "96 4",
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "94 6",
          "kind": "other",
          "name": "English negative polarity items",
          "parents": [
            "Negative polarity items",
            "Terms by semantic function"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "92 8",
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "To not know at all."
      ],
      "id": "en-have_no_idea-en-verb-8cXAjVPC",
      "links": [
        [
          "know",
          "know"
        ]
      ],
      "translations": [
        {
          "_dis1": "63 37",
          "code": "cs",
          "lang": "Czech",
          "sense": "know not",
          "word": "nemít tušení"
        },
        {
          "_dis1": "63 37",
          "code": "ro",
          "lang": "Romanian",
          "sense": "know not",
          "word": "nu avea habar"
        }
      ]
    },
    {
      "categories": [],
      "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 was clear (though we now know they really had no idea).",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To be mistaken; to not have a correct idea."
      ],
      "id": "en-have_no_idea-en-verb-wHPcdxie",
      "related": [
        {
          "_dis1": "4 96",
          "word": "I have no idea"
        }
      ]
    }
  ],
  "word": "have no idea"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English entries with language name categories using raw markup",
    "English lemmas",
    "English multiword terms",
    "English negative polarity items",
    "English terms with non-redundant non-automated sortkeys",
    "English verbs"
  ],
  "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 was clear (though we now know they really had no idea).",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To be mistaken; to not have a correct idea."
      ]
    }
  ],
  "translations": [
    {
      "code": "cs",
      "lang": "Czech",
      "sense": "know not",
      "word": "nemít tušení"
    },
    {
      "code": "ro",
      "lang": "Romanian",
      "sense": "know not",
      "word": "nu avea habar"
    }
  ],
  "word": "have no idea"
}