"unshellable" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "un",
        "3": "shellable"
      },
      "expansion": "un- + shellable",
      "name": "prefix"
    }
  ],
  "etymology_text": "un- + shellable",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "unshellable (not comparable)",
      "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 un-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Topology",
          "orig": "en:Topology",
          "parents": [
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Not shellable."
      ],
      "id": "en-unshellable-en-adj-TAnydCzW",
      "links": [
        [
          "topology",
          "topology"
        ],
        [
          "shellable",
          "shellable"
        ]
      ],
      "raw_glosses": [
        "(topology) Not shellable."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "mathematics",
        "sciences",
        "topology"
      ]
    }
  ],
  "word": "unshellable"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "un",
        "3": "shellable"
      },
      "expansion": "un- + shellable",
      "name": "prefix"
    }
  ],
  "etymology_text": "un- + shellable",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "unshellable (not comparable)",
      "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 un-",
        "English uncomparable adjectives",
        "en:Topology"
      ],
      "glosses": [
        "Not shellable."
      ],
      "links": [
        [
          "topology",
          "topology"
        ],
        [
          "shellable",
          "shellable"
        ]
      ],
      "raw_glosses": [
        "(topology) Not shellable."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "mathematics",
        "sciences",
        "topology"
      ]
    }
  ],
  "word": "unshellable"
}