"мразьныи" meaning in Vieux slave

{
  "categories": [
    {
      "kind": "other",
      "name": "Adjectifs en vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Vieux slave",
      "orig": "vieux slave",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Étymologies en vieux slave incluant une reconstruction",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de мразьнъ et d’un pronom anaphorique *'и'."
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en vieux slave de la météorologie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "De grand froid."
      ],
      "id": "fr-мразьныи-cu-adj-1huC63hj",
      "topics": [
        "meteorology"
      ]
    }
  ],
  "word": "мразьныи"
}

{
  "categories": [
    "Adjectifs en vieux slave",
    "vieux slave",
    "Étymologies en vieux slave incluant une reconstruction"
  ],
  "etymology_texts": [
    "Composé de мразьнъ et d’un pronom anaphorique *'и'."
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "categories": [
        "Lexique en vieux slave de la météorologie"
      ],
      "glosses": [
        "De grand froid."
      ],
      "topics": [
        "meteorology"
      ]
    }
  ],
  "word": "мразьныи"
}