"рѣснотивьнъ" 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"
    }
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "glosses": [
        "De la vérité, vrai, véritable, réel, correct."
      ],
      "id": "fr-рѣснотивьнъ-cu-adj-6OPfVZxk"
    }
  ],
  "synonyms": [
    {
      "word": "рѣснотивъ"
    }
  ],
  "word": "рѣснотивьнъ"
}

{
  "categories": [
    "Adjectifs en vieux slave",
    "vieux slave"
  ],
  "lang": "Vieux slave",
  "lang_code": "cu",
  "pos": "adj",
  "pos_title": "Adjectif",
  "senses": [
    {
      "glosses": [
        "De la vérité, vrai, véritable, réel, correct."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "рѣснотивъ"
    }
  ],
  "word": "рѣснотивьнъ"
}