"deadly" meaning in English

{
  "categories": [
    {
      "kind": "other",
      "name": "Terms suffixed with -ly",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "dead",
        "2": "ly"
      },
      "expansion": "dead + -ly",
      "name": "ety-suffix"
    }
  ],
  "etymology_text": "dead + -ly",
  "forms": [
    {
      "form": "deadly",
      "tags": [
        "positive"
      ]
    },
    {
      "form": "deadlier",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "deadliest",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "2": "deadlier",
        "3": "deadliest"
      },
      "expansion": "[POS TABLE]",
      "name": "adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "examples": [
        {
          "text": "The poison is very deadly."
        }
      ],
      "glosses": [
        "Something that is deadly can kill a person or thing."
      ],
      "id": "simple-deadly-en-adj-lccf0yJN",
      "synonyms": [
        {
          "word": "lethal"
        },
        {
          "word": "fatal"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈdɛd.li/"
    },
    {
      "audio": "en-us-deadly.ogg",
      "raw_tags": [
        "Audio"
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "deadly"
}

{
  "categories": [
    "Terms suffixed with -ly"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "dead",
        "2": "ly"
      },
      "expansion": "dead + -ly",
      "name": "ety-suffix"
    }
  ],
  "etymology_text": "dead + -ly",
  "forms": [
    {
      "form": "deadly",
      "tags": [
        "positive"
      ]
    },
    {
      "form": "deadlier",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "deadliest",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "2": "deadlier",
        "3": "deadliest"
      },
      "expansion": "[POS TABLE]",
      "name": "adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "examples": [
        {
          "text": "The poison is very deadly."
        }
      ],
      "glosses": [
        "Something that is deadly can kill a person or thing."
      ],
      "synonyms": [
        {
          "word": "lethal"
        },
        {
          "word": "fatal"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈdɛd.li/"
    },
    {
      "audio": "en-us-deadly.ogg",
      "raw_tags": [
        "Audio"
      ],
      "tags": [
        "US"
      ]
    }
  ],
  "word": "deadly"
}