"indubiously" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "indubious",
        "3": "ly"
      },
      "expansion": "indubious + -ly",
      "name": "suffix"
    }
  ],
  "etymology_text": "From indubious + -ly. Attested since the 17th century.",
  "forms": [
    {
      "form": "more indubiously",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most indubiously",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "indubiously (comparative more indubiously, superlative most indubiously)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -ly",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of without a doubt"
      ],
      "id": "en-indubiously-en-adv-6cFfSvMe",
      "links": [
        [
          "without a doubt",
          "without a doubt#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "without a doubt"
        }
      ]
    }
  ],
  "word": "indubiously"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "indubious",
        "3": "ly"
      },
      "expansion": "indubious + -ly",
      "name": "suffix"
    }
  ],
  "etymology_text": "From indubious + -ly. Attested since the 17th century.",
  "forms": [
    {
      "form": "more indubiously",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most indubiously",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "indubiously (comparative more indubiously, superlative most indubiously)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "English adverbs",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms suffixed with -ly",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Synonym of without a doubt"
      ],
      "links": [
        [
          "without a doubt",
          "without a doubt#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "without a doubt"
        }
      ]
    }
  ],
  "word": "indubiously"
}