"sightproof" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sight",
        "3": "proof"
      },
      "expansion": "sight + -proof",
      "name": "suffix"
    }
  ],
  "etymology_text": "sight + -proof",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "sightproof (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 -proof",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "invisible; not able to be seen"
      ],
      "id": "en-sightproof-en-adj-C3mYOOdC",
      "links": [
        [
          "invisible",
          "invisible"
        ]
      ],
      "synonyms": [
        {
          "word": "sight-proof"
        }
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈsaɪtpɹuːf/"
    }
  ],
  "word": "sightproof"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sight",
        "3": "proof"
      },
      "expansion": "sight + -proof",
      "name": "suffix"
    }
  ],
  "etymology_text": "sight + -proof",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "sightproof (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English 2-syllable words",
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms suffixed with -proof",
        "English terms with IPA pronunciation",
        "English uncomparable adjectives"
      ],
      "glosses": [
        "invisible; not able to be seen"
      ],
      "links": [
        [
          "invisible",
          "invisible"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈsaɪtpɹuːf/"
    }
  ],
  "synonyms": [
    {
      "word": "sight-proof"
    }
  ],
  "word": "sightproof"
}