"underdefined" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "defined"
      },
      "expansion": "under- + defined",
      "name": "prefix"
    }
  ],
  "etymology_text": "under- + defined",
  "forms": [
    {
      "form": "more underdefined",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most underdefined",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "underdefined (comparative more underdefined, superlative most underdefined)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "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 prefixed with under-",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2009 April 12, Michael Beschloss, “We’re Still the One”, in New York Times",
          "text": "The campaign of 2008 was but the latest instance of a presidential contest (like 1952 and 1964, to name only two) when the debate over foreign affairs was underdeveloped and the election mandate for the new president in foreign policy was strong but underdefined.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Inadequately defined."
      ],
      "id": "en-underdefined-en-adj-SCrzb22A",
      "links": [
        [
          "define",
          "define"
        ]
      ]
    }
  ],
  "word": "underdefined"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under",
        "3": "defined"
      },
      "expansion": "under- + defined",
      "name": "prefix"
    }
  ],
  "etymology_text": "under- + defined",
  "forms": [
    {
      "form": "more underdefined",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most underdefined",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "underdefined (comparative more underdefined, superlative most underdefined)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms prefixed with under-",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2009 April 12, Michael Beschloss, “We’re Still the One”, in New York Times",
          "text": "The campaign of 2008 was but the latest instance of a presidential contest (like 1952 and 1964, to name only two) when the debate over foreign affairs was underdeveloped and the election mandate for the new president in foreign policy was strong but underdefined.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Inadequately defined."
      ],
      "links": [
        [
          "define",
          "define"
        ]
      ]
    }
  ],
  "word": "underdefined"
}