"πιστοί" meaning in Greek

{
  "forms": [
    {
      "form": "pistoí",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "adjective form",
        "3": "pistoí",
        "g": "m"
      },
      "expansion": "πιστοί • (pistoí) m (pistoí)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Nominative masculine plural"
        },
        {
          "text": "Vocative masculine plural"
        }
      ],
      "form_of": [
        {
          "word": "πιστός"
        }
      ],
      "glosses": [
        "Adjective form of πιστός"
      ],
      "id": "en-πιστοί-el-adj-kSf4Av06",
      "links": [
        [
          "πιστός",
          "πιστός"
        ]
      ],
      "tags": [
        "adjective",
        "form-of"
      ]
    }
  ],
  "word": "πιστοί"
}

{
  "forms": [
    {
      "form": "pistoí",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "adjective form",
        "3": "pistoí",
        "g": "m"
      },
      "expansion": "πιστοί • (pistoí) m (pistoí)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Greek adjective forms",
        "Greek entries with incorrect language header",
        "Greek non-lemma forms"
      ],
      "examples": [
        {
          "text": "Nominative masculine plural"
        },
        {
          "text": "Vocative masculine plural"
        }
      ],
      "form_of": [
        {
          "word": "πιστός"
        }
      ],
      "glosses": [
        "Adjective form of πιστός"
      ],
      "links": [
        [
          "πιστός",
          "πιστός"
        ]
      ],
      "tags": [
        "adjective",
        "form-of"
      ]
    }
  ],
  "word": "πιστοί"
}