"fast asleep" meaning in English

{
  "head_templates": [
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      "args": {
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      "expansion": "fast asleep (not comparable)",
      "name": "en-adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
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          "kind": "other",
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        {
          "kind": "other",
          "name": "Terms with Yoruba translations",
          "parents": [],
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Sleep",
          "orig": "en:Sleep",
          "parents": [
            "Body",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Sleeping, in a deep sleep."
      ],
      "id": "en-fast_asleep-en-adj-WlJeTMUY",
      "links": [
        [
          "deep sleep",
          "deep sleep"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) Sleeping, in a deep sleep."
      ],
      "related": [
        {
          "word": "wide awake"
        }
      ],
      "synonyms": [
        {
          "word": "sound asleep"
        },
        {
          "word": "down for the count"
        }
      ],
      "tags": [
        "idiomatic",
        "not-comparable"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "chénshuì",
          "sense": "in a deep sleep",
          "word": "沉睡"
        },
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "shúshuì",
          "sense": "in a deep sleep",
          "word": "熟睡"
        },
        {
          "code": "nl",
          "lang": "Dutch",
          "sense": "in a deep sleep",
          "word": "als een blok slapen"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "in a deep sleep",
          "word": "sikiunessa"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "in a deep sleep",
          "tags": [
            "adverb"
          ],
          "word": "sikeässä unessa"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "in a deep sleep",
          "tags": [
            "phrase",
            "prepositional"
          ],
          "word": "in tiefem Schlaf"
        },
        {
          "code": "ro",
          "lang": "Romanian",
          "sense": "in a deep sleep",
          "tags": [
            "phrase",
            "prepositional"
          ],
          "word": "într-un somn adânc"
        },
        {
          "code": "yo",
          "lang": "Yoruba",
          "sense": "in a deep sleep",
          "tags": [
            "ideophonic"
          ],
          "word": "fọnfọn"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-fast asleep.ogg",
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      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/1/11/En-au-fast_asleep.ogg"
    }
  ],
  "word": "fast asleep"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
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      "expansion": "fast asleep (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "wide awake"
    }
  ],
  "senses": [
    {
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        "English adjectives",
        "English entries with incorrect language header",
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        "English uncomparable adjectives",
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        "Mandarin terms with redundant transliterations",
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        "Pages with entries",
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        "Terms with Finnish translations",
        "Terms with German translations",
        "Terms with Mandarin translations",
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        "en:Sleep"
      ],
      "glosses": [
        "Sleeping, in a deep sleep."
      ],
      "links": [
        [
          "deep sleep",
          "deep sleep"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) Sleeping, in a deep sleep."
      ],
      "tags": [
        "idiomatic",
        "not-comparable"
      ]
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  ],
  "synonyms": [
    {
      "word": "sound asleep"
    },
    {
      "word": "down for the count"
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "chénshuì",
      "sense": "in a deep sleep",
      "word": "沉睡"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "shúshuì",
      "sense": "in a deep sleep",
      "word": "熟睡"
    },
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "in a deep sleep",
      "word": "als een blok slapen"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "in a deep sleep",
      "word": "sikiunessa"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "in a deep sleep",
      "tags": [
        "adverb"
      ],
      "word": "sikeässä unessa"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "in a deep sleep",
      "tags": [
        "phrase",
        "prepositional"
      ],
      "word": "in tiefem Schlaf"
    },
    {
      "code": "ro",
      "lang": "Romanian",
      "sense": "in a deep sleep",
      "tags": [
        "phrase",
        "prepositional"
      ],
      "word": "într-un somn adânc"
    },
    {
      "code": "yo",
      "lang": "Yoruba",
      "sense": "in a deep sleep",
      "tags": [
        "ideophonic"
      ],
      "word": "fọnfọn"
    }
  ],
  "word": "fast asleep"
}