"fidelísimamente" meaning in Spanish

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "fidelísimo",
        "3": "-mente"
      },
      "expansion": "fidelísimo + -mente",
      "name": "af"
    }
  ],
  "etymology_text": "From fidelísimo + -mente.",
  "head_templates": [
    {
      "args": {},
      "expansion": "fidelísimamente",
      "name": "es-adv"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish terms suffixed with -mente",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "fielmente"
        }
      ],
      "glosses": [
        "superlative degree of fielmente"
      ],
      "id": "en-fidelísimamente-es-adv-Ci8j-X7G",
      "links": [
        [
          "fielmente",
          "fielmente#Spanish"
        ]
      ],
      "tags": [
        "form-of",
        "superlative"
      ]
    }
  ],
  "word": "fidelísimamente"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "es",
        "2": "fidelísimo",
        "3": "-mente"
      },
      "expansion": "fidelísimo + -mente",
      "name": "af"
    }
  ],
  "etymology_text": "From fidelísimo + -mente.",
  "head_templates": [
    {
      "args": {},
      "expansion": "fidelísimamente",
      "name": "es-adv"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Spanish adverbs",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish superlative adverbs",
        "Spanish terms suffixed with -mente"
      ],
      "form_of": [
        {
          "word": "fielmente"
        }
      ],
      "glosses": [
        "superlative degree of fielmente"
      ],
      "links": [
        [
          "fielmente",
          "fielmente#Spanish"
        ]
      ],
      "tags": [
        "form-of",
        "superlative"
      ]
    }
  ],
  "word": "fidelísimamente"
}