"hard as nails" meaning in English

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      "expansion": "hard as nails (not comparable)",
      "name": "en-adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
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          "name": "English similes",
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      "glosses": [
        "Very unsympathetic; callous"
      ],
      "id": "en-hard_as_nails-en-adj-jV4ocv8t",
      "links": [
        [
          "unsympathetic",
          "unsympathetic"
        ],
        [
          "callous",
          "callous"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile, idiomatic) Very unsympathetic; callous"
      ],
      "tags": [
        "idiomatic",
        "not-comparable"
      ]
    },
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          "kind": "other",
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      "glosses": [
        "Able to endure difficulties; tough"
      ],
      "id": "en-hard_as_nails-en-adj-ANXimzzV",
      "links": [
        [
          "endure",
          "endure"
        ],
        [
          "tough",
          "tough"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile, idiomatic) Able to endure difficulties; tough"
      ],
      "related": [
        {
          "_dis1": "38 62",
          "word": "hard nail"
        },
        {
          "_dis1": "38 62",
          "word": "tough as nails"
        }
      ],
      "tags": [
        "idiomatic",
        "not-comparable"
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  "sounds": [
    {
      "rhymes": "-eɪlz"
    },
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      "audio": "en-au-hard as nails.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/2/2a/En-au-hard_as_nails.ogg/En-au-hard_as_nails.ogg.mp3",
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        "Australia"
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      "text": "Audio (AU)"
    }
  ],
  "word": "hard as nails"
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    "Rhymes:English/eɪlz/3 syllables"
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      "expansion": "hard as nails (not comparable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "hard nail"
    },
    {
      "word": "tough as nails"
    }
  ],
  "senses": [
    {
      "categories": [
        "English idioms",
        "English similes"
      ],
      "glosses": [
        "Very unsympathetic; callous"
      ],
      "links": [
        [
          "unsympathetic",
          "unsympathetic"
        ],
        [
          "callous",
          "callous"
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      "qualifier": "simile",
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        "(simile, idiomatic) Very unsympathetic; callous"
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      "glosses": [
        "Able to endure difficulties; tough"
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          "endure",
          "endure"
        ],
        [
          "tough",
          "tough"
        ]
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      "qualifier": "simile",
      "raw_glosses": [
        "(simile, idiomatic) Able to endure difficulties; tough"
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        "idiomatic",
        "not-comparable"
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  "sounds": [
    {
      "rhymes": "-eɪlz"
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      "audio": "en-au-hard as nails.ogg",
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  "word": "hard as nails"
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