"quietest" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes d’adjectifs en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "adj",
  "pos_title": "Forme d’adjectif",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Adjectifs superlatifs en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Superlatif de quiet."
      ],
      "id": "fr-quietest-en-adj-NlG0dfy7"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "quietest"
}

{
  "categories": [
    "Formes d’adjectifs en anglais",
    "anglais"
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "adj",
  "pos_title": "Forme d’adjectif",
  "senses": [
    {
      "categories": [
        "Adjectifs superlatifs en anglais"
      ],
      "glosses": [
        "Superlatif de quiet."
      ]
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "quietest"
}