"серйозною" meaning in Ukrainian

{
  "forms": [
    {
      "form": "серйо́зною",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "serjóznoju",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "uk",
        "2": "adjective form",
        "head": "серйо́зною"
      },
      "expansion": "серйо́зною • (serjóznoju)",
      "name": "head"
    }
  ],
  "lang": "Ukrainian",
  "lang_code": "uk",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Ukrainian entries with incorrect language header",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "serjóznyj",
          "word": "серйо́зний"
        }
      ],
      "glosses": [
        "feminine instrumental singular of серйо́зний (serjóznyj)"
      ],
      "id": "en-серйозною-uk-adj-aiTRS5dT",
      "links": [
        [
          "серйо́зний",
          "серйозний#Ukrainian"
        ]
      ],
      "tags": [
        "feminine",
        "form-of",
        "instrumental",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[seˈrjɔznɔjʊ]"
    }
  ],
  "word": "серйозною"
}

{
  "forms": [
    {
      "form": "серйо́зною",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "serjóznoju",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "uk",
        "2": "adjective form",
        "head": "серйо́зною"
      },
      "expansion": "серйо́зною • (serjóznoju)",
      "name": "head"
    }
  ],
  "lang": "Ukrainian",
  "lang_code": "uk",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Ukrainian adjective forms",
        "Ukrainian entries with incorrect language header",
        "Ukrainian non-lemma forms",
        "Ukrainian terms with IPA pronunciation"
      ],
      "form_of": [
        {
          "extra": "serjóznyj",
          "word": "серйо́зний"
        }
      ],
      "glosses": [
        "feminine instrumental singular of серйо́зний (serjóznyj)"
      ],
      "links": [
        [
          "серйо́зний",
          "серйозний#Ukrainian"
        ]
      ],
      "tags": [
        "feminine",
        "form-of",
        "instrumental",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[seˈrjɔznɔjʊ]"
    }
  ],
  "word": "серйозною"
}