"uninitialled" meaning in English

{
  "antonyms": [
    {
      "word": "initialled"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "un",
        "3": "initialled"
      },
      "expansion": "un- + initialled",
      "name": "prefix"
    }
  ],
  "etymology_text": "un- + initialled",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "uninitialled (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with un-",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Not being initialled."
      ],
      "id": "en-uninitialled-en-adj-1VH-I5Yu",
      "links": [
        [
          "initialled",
          "initialled"
        ]
      ],
      "raw_glosses": [
        "(British) Not being initialled."
      ],
      "synonyms": [
        {
          "tags": [
            "US"
          ],
          "word": "uninitialed"
        }
      ],
      "tags": [
        "British",
        "not-comparable"
      ],
      "translations": [
        {
          "code": "el",
          "lang": "Greek",
          "roman": "amonográfitos",
          "sense": "Not being initialled",
          "word": "αμονογράφητος"
        }
      ]
    }
  ],
  "word": "uninitialled"
}

{
  "antonyms": [
    {
      "word": "initialled"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "un",
        "3": "initialled"
      },
      "expansion": "un- + initialled",
      "name": "prefix"
    }
  ],
  "etymology_text": "un- + initialled",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "uninitialled (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "British English",
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms prefixed with un-",
        "English uncomparable adjectives"
      ],
      "glosses": [
        "Not being initialled."
      ],
      "links": [
        [
          "initialled",
          "initialled"
        ]
      ],
      "raw_glosses": [
        "(British) Not being initialled."
      ],
      "tags": [
        "British",
        "not-comparable"
      ]
    }
  ],
  "synonyms": [
    {
      "tags": [
        "US"
      ],
      "word": "uninitialed"
    }
  ],
  "translations": [
    {
      "code": "el",
      "lang": "Greek",
      "roman": "amonográfitos",
      "sense": "Not being initialled",
      "word": "αμονογράφητος"
    }
  ],
  "word": "uninitialled"
}