"unhashable" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "un",
        "3": "hashable"
      },
      "expansion": "un- + hashable",
      "name": "prefix"
    }
  ],
  "etymology_text": "un- + hashable",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "unhashable (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": "Computing",
          "orig": "en:Computing",
          "parents": [
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2012, Allen B. Downey, Think Complexity: Complexity Science and Computational Modeling, page 28",
          "text": "Mutable types like lists and dictionaries are unhashable.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Not hashable."
      ],
      "id": "en-unhashable-en-adj-k~mzD1D1",
      "links": [
        [
          "computing",
          "computing#Noun"
        ],
        [
          "hashable",
          "hashable"
        ]
      ],
      "raw_glosses": [
        "(computing) Not hashable."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "unhashable"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "un",
        "3": "hashable"
      },
      "expansion": "un- + hashable",
      "name": "prefix"
    }
  ],
  "etymology_text": "un- + hashable",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "unhashable (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 terms with quotations",
        "English uncomparable adjectives",
        "Quotation templates to be cleaned",
        "en:Computing"
      ],
      "examples": [
        {
          "ref": "2012, Allen B. Downey, Think Complexity: Complexity Science and Computational Modeling, page 28",
          "text": "Mutable types like lists and dictionaries are unhashable.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Not hashable."
      ],
      "links": [
        [
          "computing",
          "computing#Noun"
        ],
        [
          "hashable",
          "hashable"
        ]
      ],
      "raw_glosses": [
        "(computing) Not hashable."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "unhashable"
}