"retard" meaning in English

{
  "forms": [
    {
      "form": "retard"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "η καθυστέρηση"
      ],
      "id": "el-retard-en-noun-1W0~SfWB"
    },
    {
      "glosses": [
        "καθυστερημένος, το άτομο με νοητική καθυστέρηση"
      ],
      "id": "el-retard-en-noun-PUuD5Yxh",
      "raw_tags": [
        "αργκό",
        "μειωτικό"
      ]
    },
    {
      "glosses": [
        "ο βλάκας"
      ],
      "id": "el-retard-en-noun-x5qzYF47",
      "raw_tags": [
        "αργκό",
        "μειωτικό"
      ]
    }
  ],
  "word": "retard"
}

{
  "forms": [
    {
      "form": "retard"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "glosses": [
        "καθυστερώ"
      ],
      "id": "el-retard-en-verb-cgobvsuU",
      "raw_tags": [
        "μεταβατικό"
      ]
    },
    {
      "glosses": [
        "αναβάλλω"
      ],
      "id": "el-retard-en-verb-5xprAlEl",
      "raw_tags": [
        "μεταβατικό"
      ]
    }
  ],
  "word": "retard"
}

{
  "forms": [
    {
      "form": "retard"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "η καθυστέρηση"
      ]
    },
    {
      "glosses": [
        "καθυστερημένος, το άτομο με νοητική καθυστέρηση"
      ],
      "raw_tags": [
        "αργκό",
        "μειωτικό"
      ]
    },
    {
      "glosses": [
        "ο βλάκας"
      ],
      "raw_tags": [
        "αργκό",
        "μειωτικό"
      ]
    }
  ],
  "word": "retard"
}

{
  "forms": [
    {
      "form": "retard"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "glosses": [
        "καθυστερώ"
      ],
      "raw_tags": [
        "μεταβατικό"
      ]
    },
    {
      "glosses": [
        "αναβάλλω"
      ],
      "raw_tags": [
        "μεταβατικό"
      ]
    }
  ],
  "word": "retard"
}