"bitter cold" meaning in English

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  "etymology_text": "Coined by William Shakespeare in 1602 in \"Hamlet,\" act 1, scene 1:\n: For this relief much thanks. 'Tis bitter cold,\n: And I am sick at heart.",
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      "form": "bitterly cold",
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      "expansion": "bitter cold",
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      "glosses": [
        "Very cold and unpleasant. (of an environment)"
      ],
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          "unpleasant",
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          "environment",
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  "word": "bitter cold"
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  "etymology_text": "Coined by William Shakespeare in 1602 in \"Hamlet,\" act 1, scene 1:\n: For this relief much thanks. 'Tis bitter cold,\n: And I am sick at heart.",
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      "form": "bitterly cold",
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  "word": "bitter cold"
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