"tough as nails" meaning in English

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  "lang_code": "en",
  "pos": "adj",
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      "glosses": [
        "Having a hard, strong, and determined mindset."
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          "hard",
          "hard"
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          "strong",
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          "determined",
          "determined"
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          "mindset",
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        "(idiomatic, simile) Having a hard, strong, and determined mindset."
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      "translations": [
        {
          "_dis1": "92 8",
          "code": "fr",
          "lang": "French",
          "sense": "having a determined mindset",
          "word": "dur(e) à cuire"
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        {
          "_dis1": "12 88",
          "word": "hard as nails"
        },
        {
          "_dis1": "12 88",
          "word": "diehard"
        },
        {
          "_dis1": "12 88",
          "word": "hardcore"
        },
        {
          "_dis1": "12 88",
          "word": "steely-eyed"
        }
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      "glosses": [
        "Very hard; tough"
      ],
      "id": "en-tough_as_nails-en-adj-cK~oe4uq",
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Very hard; tough"
      ],
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        "not-comparable"
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  "word": "tough as nails"
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    {
      "word": "hard as nails"
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    {
      "word": "diehard"
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    {
      "word": "hardcore"
    },
    {
      "word": "steely-eyed"
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      "expansion": "tough as nails (not comparable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
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        "English similes"
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      "glosses": [
        "Having a hard, strong, and determined mindset."
      ],
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        [
          "hard",
          "hard"
        ],
        [
          "strong",
          "strong"
        ],
        [
          "determined",
          "determined"
        ],
        [
          "mindset",
          "mindset"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(idiomatic, simile) Having a hard, strong, and determined mindset."
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        "idiomatic",
        "not-comparable"
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    {
      "categories": [
        "English similes"
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      "glosses": [
        "Very hard; tough"
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Very hard; tough"
      ],
      "tags": [
        "not-comparable"
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  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "having a determined mindset",
      "word": "dur(e) à cuire"
    }
  ],
  "word": "tough as nails"
}