"нечаянно" meaning in Russian

{
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "неча́янный",
        "3": "-о"
      },
      "expansion": "неча́янный (nečájannyj) + -о (-o)",
      "name": "af"
    }
  ],
  "etymology_text": "неча́янный (nečájannyj) + -о (-o)",
  "forms": [
    {
      "form": "неча́янно",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "nečájanno",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "неча́янно"
      },
      "expansion": "неча́янно • (nečájanno)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "senses": [
    {
      "antonyms": [
        {
          "word": "специа́льно"
        }
      ],
      "categories": [
        {
          "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"
        }
      ],
      "derived": [
        {
          "roman": "za nečájanno bʹjut otčájanno",
          "word": "за неча́янно бьют отча́янно"
        }
      ],
      "glosses": [
        "inadvertently, accidentally, unintentionally"
      ],
      "id": "en-нечаянно-ru-adv-VEUPB0if",
      "links": [
        [
          "inadvertently",
          "inadvertently"
        ],
        [
          "accidentally",
          "accidentally"
        ],
        [
          "unintentionally",
          "unintentionally"
        ]
      ],
      "synonyms": [
        {
          "word": "случа́йно"
        },
        {
          "roman": "nečájno",
          "word": "неча́йно"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[nʲɪˈt͡ɕæ(j)ɪn(ː)ə]"
    },
    {
      "ipa": "[nʲɪˈt͡ɕæjnə]"
    },
    {
      "audio": "Ru-нечаянно.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/17/Ru-%D0%BD%D0%B5%D1%87%D0%B0%D1%8F%D0%BD%D0%BD%D0%BE.ogg/Ru-%D0%BD%D0%B5%D1%87%D0%B0%D1%8F%D0%BD%D0%BD%D0%BE.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/1/17/Ru-%D0%BD%D0%B5%D1%87%D0%B0%D1%8F%D0%BD%D0%BD%D0%BE.ogg",
      "text": "Audio"
    }
  ],
  "word": "нечаянно"
}

{
  "derived": [
    {
      "roman": "za nečájanno bʹjut otčájanno",
      "word": "за неча́янно бьют отча́янно"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "неча́янный",
        "3": "-о"
      },
      "expansion": "неча́янный (nečájannyj) + -о (-o)",
      "name": "af"
    }
  ],
  "etymology_text": "неча́янный (nečájannyj) + -о (-o)",
  "forms": [
    {
      "form": "неча́янно",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "nečájanno",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "неча́янно"
      },
      "expansion": "неча́янно • (nečájanno)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "senses": [
    {
      "antonyms": [
        {
          "word": "специа́льно"
        }
      ],
      "categories": [
        "Russian 3-syllable words",
        "Russian 4-syllable words",
        "Russian adverbs",
        "Russian entries with incorrect language header",
        "Russian lemmas",
        "Russian terms suffixed with -о",
        "Russian terms with IPA pronunciation",
        "Russian terms with audio links"
      ],
      "glosses": [
        "inadvertently, accidentally, unintentionally"
      ],
      "links": [
        [
          "inadvertently",
          "inadvertently"
        ],
        [
          "accidentally",
          "accidentally"
        ],
        [
          "unintentionally",
          "unintentionally"
        ]
      ],
      "synonyms": [
        {
          "word": "случа́йно"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[nʲɪˈt͡ɕæ(j)ɪn(ː)ə]"
    },
    {
      "ipa": "[nʲɪˈt͡ɕæjnə]"
    },
    {
      "audio": "Ru-нечаянно.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/17/Ru-%D0%BD%D0%B5%D1%87%D0%B0%D1%8F%D0%BD%D0%BD%D0%BE.ogg/Ru-%D0%BD%D0%B5%D1%87%D0%B0%D1%8F%D0%BD%D0%BD%D0%BE.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/1/17/Ru-%D0%BD%D0%B5%D1%87%D0%B0%D1%8F%D0%BD%D0%BD%D0%BE.ogg",
      "text": "Audio"
    }
  ],
  "synonyms": [
    {
      "roman": "nečájno",
      "word": "неча́йно"
    }
  ],
  "word": "нечаянно"
}