"air-built" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "air-built (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"
        }
      ],
      "examples": [
        {
          "ref": "1823, The Classical Journal, volume 27, page 1",
          "text": "The city too, with all the glory she has derived from her misfortunes, has not been able to escape the suspicion of being nothing better than an air-built fabric, though the poet has assigned her a local habitation […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Built upon air; lacking a solid foundation."
      ],
      "id": "en-air-built-en-adj-DU2B3H1p",
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "air-built"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "air-built (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 multiword terms",
        "English terms with quotations",
        "English uncomparable adjectives",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1823, The Classical Journal, volume 27, page 1",
          "text": "The city too, with all the glory she has derived from her misfortunes, has not been able to escape the suspicion of being nothing better than an air-built fabric, though the poet has assigned her a local habitation […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Built upon air; lacking a solid foundation."
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "air-built"
}