"bolsterless" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "bolster",
        "3": "-less"
      },
      "expansion": "bolster + -less",
      "name": "af"
    }
  ],
  "etymology_text": "From bolster + -less.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "bolsterless (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": "1950 January, “British Railways Double-Deck Suburban Stock”, in Railway Magazine, page 57",
          "text": "Bolsterless trailer bogies have been used, incorporating in the construction laminated springs mounted on the axle boxes, and steel helical springs with auxiliary rubbers, thus maintaining the high standard of springing of the swing bolster bogies.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Without a bolster."
      ],
      "id": "en-bolsterless-en-adj-20OuNSfL",
      "links": [
        [
          "bolster",
          "bolster"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "bolsterless"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "bolster",
        "3": "-less"
      },
      "expansion": "bolster + -less",
      "name": "af"
    }
  ],
  "etymology_text": "From bolster + -less.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "bolsterless (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"
      ],
      "examples": [
        {
          "ref": "1950 January, “British Railways Double-Deck Suburban Stock”, in Railway Magazine, page 57",
          "text": "Bolsterless trailer bogies have been used, incorporating in the construction laminated springs mounted on the axle boxes, and steel helical springs with auxiliary rubbers, thus maintaining the high standard of springing of the swing bolster bogies.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Without a bolster."
      ],
      "links": [
        [
          "bolster",
          "bolster"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "bolsterless"
}