"якнайчистішою" meaning in Ukrainien

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes d’adjectifs en ukrainien",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ukrainien",
      "orig": "ukrainien",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "якнайчисті́шою",
      "tags": [
        "canonical"
      ]
    }
  ],
  "lang": "Ukrainien",
  "lang_code": "uk",
  "pos": "adj",
  "pos_title": "Forme d’adjectif",
  "raw_tags": [
    "^((jaknaïtšystišoju))"
  ],
  "senses": [
    {
      "form_of": [
        {
          "word": "якнайчисті́ший"
        }
      ],
      "glosses": [
        "Instrumental féminin singulier de якнайчисті́ший."
      ],
      "id": "fr-якнайчистішою-uk-adj-Z8psD3yO"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "якнайчистішою"
}

{
  "categories": [
    "Formes d’adjectifs en ukrainien",
    "ukrainien"
  ],
  "forms": [
    {
      "form": "якнайчисті́шою",
      "tags": [
        "canonical"
      ]
    }
  ],
  "lang": "Ukrainien",
  "lang_code": "uk",
  "pos": "adj",
  "pos_title": "Forme d’adjectif",
  "raw_tags": [
    "^((jaknaïtšystišoju))"
  ],
  "senses": [
    {
      "form_of": [
        {
          "word": "якнайчисті́ший"
        }
      ],
      "glosses": [
        "Instrumental féminin singulier de якнайчисті́ший."
      ]
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "якнайчистішою"
}