"истово" meaning in Russian

{
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "и́стовый",
        "3": "-о"
      },
      "expansion": "и́стовый (ístovyj) + -о (-o)",
      "name": "af"
    }
  ],
  "etymology_text": "и́стовый (ístovyj) + -о (-o)",
  "forms": [
    {
      "form": "и́стово",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "ístovo",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "и́стово"
      },
      "expansion": "и́стово • (ístovo)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Russian terms suffixed with -о",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "fervently, ardently"
      ],
      "id": "en-истово-ru-adv-~dv29K06",
      "links": [
        [
          "fervently",
          "fervently"
        ],
        [
          "ardently",
          "ardently"
        ]
      ],
      "related": [
        {
          "roman": "ístovyj",
          "word": "и́стовый"
        },
        {
          "roman": "ístina",
          "word": "и́стина"
        },
        {
          "roman": "ístinnyj",
          "word": "и́стинный"
        },
        {
          "roman": "ístinno",
          "word": "и́стинно"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈistəvə]"
    }
  ],
  "word": "истово"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "и́стовый",
        "3": "-о"
      },
      "expansion": "и́стовый (ístovyj) + -о (-o)",
      "name": "af"
    }
  ],
  "etymology_text": "и́стовый (ístovyj) + -о (-o)",
  "forms": [
    {
      "form": "и́стово",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "ístovo",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "и́стово"
      },
      "expansion": "и́стово • (ístovo)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "related": [
    {
      "roman": "ístovyj",
      "word": "и́стовый"
    },
    {
      "roman": "ístina",
      "word": "и́стина"
    },
    {
      "roman": "ístinnyj",
      "word": "и́стинный"
    },
    {
      "roman": "ístinno",
      "word": "и́стинно"
    }
  ],
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Russian 3-syllable words",
        "Russian adverbs",
        "Russian entries with incorrect language header",
        "Russian lemmas",
        "Russian terms suffixed with -о",
        "Russian terms with IPA pronunciation"
      ],
      "glosses": [
        "fervently, ardently"
      ],
      "links": [
        [
          "fervently",
          "fervently"
        ],
        [
          "ardently",
          "ardently"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈistəvə]"
    }
  ],
  "word": "истово"
}