"con comme une chaise" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "dumb as a chair"
      },
      "expansion": "“dumb as a chair”",
      "name": "m-g"
    },
    {
      "args": {
        "1": "dumb as a chair"
      },
      "expansion": "Literally, “dumb as a chair”",
      "name": "lit"
    }
  ],
  "etymology_text": "Literally, “dumb as a chair”.",
  "forms": [
    {
      "form": "conne comme une chaise",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "cons comme des chaises",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "connes comme des chaises",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "fp": "connes comme des chaises",
        "mp": "cons comme des chaises"
      },
      "expansion": "con comme une chaise (feminine conne comme une chaise, masculine plural cons comme des chaises, feminine plural connes comme des chaises)",
      "name": "fr-adj"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "French similes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "thick as a brick; dumb as a post (very stupid)"
      ],
      "id": "en-con_comme_une_chaise-fr-adj-xI5Zxije",
      "links": [
        [
          "thick as a brick",
          "thick as a brick"
        ],
        [
          "dumb as a post",
          "dumb as a post"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile, vulgar) thick as a brick; dumb as a post (very stupid)"
      ],
      "synonyms": [
        {
          "word": "con comme un balai"
        },
        {
          "word": "con comme la lune"
        },
        {
          "word": "con comme un manche"
        },
        {
          "word": "bête à manger du foin"
        },
        {
          "word": "bête comme ses pieds"
        }
      ],
      "tags": [
        "vulgar"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/kɔ̃ kɔ.m‿yn ʃɛz/"
    },
    {
      "audio": "LL-Q150 (fra)-Lepticed7-con comme une chaise.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/f/f7/LL-Q150_%28fra%29-Lepticed7-con_comme_une_chaise.wav/LL-Q150_%28fra%29-Lepticed7-con_comme_une_chaise.wav.mp3",
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    }
  ],
  "word": "con comme une chaise"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "dumb as a chair"
      },
      "expansion": "“dumb as a chair”",
      "name": "m-g"
    },
    {
      "args": {
        "1": "dumb as a chair"
      },
      "expansion": "Literally, “dumb as a chair”",
      "name": "lit"
    }
  ],
  "etymology_text": "Literally, “dumb as a chair”.",
  "forms": [
    {
      "form": "conne comme une chaise",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "cons comme des chaises",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "connes comme des chaises",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "fp": "connes comme des chaises",
        "mp": "cons comme des chaises"
      },
      "expansion": "con comme une chaise (feminine conne comme une chaise, masculine plural cons comme des chaises, feminine plural connes comme des chaises)",
      "name": "fr-adj"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "French adjectives",
        "French adjectives with red links in their headword lines",
        "French entries with incorrect language header",
        "French lemmas",
        "French multiword terms",
        "French similes",
        "French terms with IPA pronunciation",
        "French vulgarities",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "thick as a brick; dumb as a post (very stupid)"
      ],
      "links": [
        [
          "thick as a brick",
          "thick as a brick"
        ],
        [
          "dumb as a post",
          "dumb as a post"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile, vulgar) thick as a brick; dumb as a post (very stupid)"
      ],
      "synonyms": [
        {
          "word": "con comme un balai"
        },
        {
          "word": "con comme la lune"
        },
        {
          "word": "con comme un manche"
        },
        {
          "word": "bête à manger du foin"
        },
        {
          "word": "bête comme ses pieds"
        }
      ],
      "tags": [
        "vulgar"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/kɔ̃ kɔ.m‿yn ʃɛz/"
    },
    {
      "audio": "LL-Q150 (fra)-Lepticed7-con comme une chaise.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/f/f7/LL-Q150_%28fra%29-Lepticed7-con_comme_une_chaise.wav/LL-Q150_%28fra%29-Lepticed7-con_comme_une_chaise.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/f/f7/LL-Q150_%28fra%29-Lepticed7-con_comme_une_chaise.wav/LL-Q150_%28fra%29-Lepticed7-con_comme_une_chaise.wav.ogg"
    }
  ],
  "word": "con comme une chaise"
}