"solid as a rock" meaning in English

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      "expansion": "solid as a rock (not comparable)",
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  "lang_code": "en",
  "pos": "adj",
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      "examples": [
        {
          "text": "We're not going to be able to break down this door: it's solid as a rock.",
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      "glosses": [
        "Extremely thick and heavy, so as to make it impossible to move."
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      "links": [
        [
          "thick",
          "thick"
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          "heavy",
          "heavy"
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      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Extremely thick and heavy, so as to make it impossible to move."
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      "synonyms": [
        {
          "_dis1": "100 0",
          "sense": "thick and heavy",
          "word": "rock solid"
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        "not-comparable"
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      "examples": [
        {
          "text": "Stewart has been solid as a rock ever since becoming the new vice-chairman.",
          "type": "example"
        }
      ],
      "glosses": [
        "Very reliable and dependable"
      ],
      "id": "en-solid_as_a_rock-en-adj-oSCZyE89",
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        [
          "reliable",
          "reliable"
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          "dependable",
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        "(simile, of a person) Very reliable and dependable"
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        {
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          "sense": "reliable and dependable",
          "word": "rock solid"
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  "word": "solid as a rock"
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  "head_templates": [
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      "expansion": "solid as a rock (not comparable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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      "examples": [
        {
          "text": "We're not going to be able to break down this door: it's solid as a rock.",
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      "glosses": [
        "Extremely thick and heavy, so as to make it impossible to move."
      ],
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          "thick",
          "thick"
        ],
        [
          "heavy",
          "heavy"
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      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Extremely thick and heavy, so as to make it impossible to move."
      ],
      "tags": [
        "not-comparable"
      ]
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        "English similes",
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      "examples": [
        {
          "text": "Stewart has been solid as a rock ever since becoming the new vice-chairman.",
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      ],
      "glosses": [
        "Very reliable and dependable"
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          "reliable",
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        [
          "dependable",
          "dependable"
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      "qualifier": "simile",
      "raw_glosses": [
        "(simile, of a person) Very reliable and dependable"
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        "not-comparable"
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  "synonyms": [
    {
      "sense": "thick and heavy",
      "word": "rock solid"
    },
    {
      "sense": "reliable and dependable",
      "word": "rock solid"
    }
  ],
  "word": "solid as a rock"
}