"bête comme un âne" meaning in Français

{
  "categories": [
    {
      "kind": "other",
      "name": "Comparaisons en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Compositions en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Idiotismes animaliers en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions adjectivales en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ê en français",
      "orig": "ê en français",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de bête, comme et âne."
  ],
  "forms": [
    {
      "form": "bêtes comme des ânes",
      "raw_tags": [
        "rowspan=\"2\" :Modèle:! Masculin et féminin"
      ],
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "adj",
  "pos_title": "Locution adjectivale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Insultes en français",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en français",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Idiot, stupide."
      ],
      "id": "fr-bête_comme_un_âne-fr-adj-LKP29U1I",
      "tags": [
        "offensive"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\bɛt kɔm œ̃ ɑn\\"
    }
  ],
  "tags": [
    "feminine",
    "masculine"
  ],
  "word": "bête comme un âne"
}

{
  "categories": [
    "Comparaisons en français",
    "Compositions en français",
    "Idiotismes animaliers en français",
    "Locutions adjectivales en français",
    "français",
    "ê en français"
  ],
  "etymology_texts": [
    "Composé de bête, comme et âne."
  ],
  "forms": [
    {
      "form": "bêtes comme des ânes",
      "raw_tags": [
        "rowspan=\"2\" :Modèle:! Masculin et féminin"
      ],
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "adj",
  "pos_title": "Locution adjectivale",
  "senses": [
    {
      "categories": [
        "Insultes en français",
        "Wiktionnaire:Exemples manquants en français"
      ],
      "glosses": [
        "Idiot, stupide."
      ],
      "tags": [
        "offensive"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\bɛt kɔm œ̃ ɑn\\"
    }
  ],
  "tags": [
    "feminine",
    "masculine"
  ],
  "word": "bête comme un âne"
}