"dayless" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "day",
        "3": "less"
      },
      "expansion": "day + -less",
      "name": "suffix"
    }
  ],
  "etymology_text": "day + -less",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "dayless (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 suffixed with -less",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1816, Lord Byron, The Prisoner of Chillon",
          "text": "And when thy sons to fetters are consign'd — To fetters, and the damp vault's dayless gloom",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Without day."
      ],
      "id": "en-dayless-en-adj-Pv~nbkqu",
      "links": [
        [
          "day",
          "day"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "dayless"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "day",
        "3": "less"
      },
      "expansion": "day + -less",
      "name": "suffix"
    }
  ],
  "etymology_text": "day + -less",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "dayless (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 suffixed with -less",
        "English terms with quotations",
        "English uncomparable adjectives",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1816, Lord Byron, The Prisoner of Chillon",
          "text": "And when thy sons to fetters are consign'd — To fetters, and the damp vault's dayless gloom",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Without day."
      ],
      "links": [
        [
          "day",
          "day"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "dayless"
}