"un-" meaning in English

{
  "forms": [
    {
      "form": "un-",
      "raw_tags": [
        "Prefix"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "prefix"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "senses": [
    {
      "examples": [
        {
          "text": "You could say, \"He is not happy\", \"He is unhappy\", or \"He is sad\"."
        }
      ],
      "glosses": [
        "You add \"un-\" to the front of an adjective or adverb usually to mean the opposite of the original word making an antonym."
      ],
      "id": "simple-un--en-prefix-RTIFghKY"
    },
    {
      "examples": [
        {
          "text": "First he wound the string on the stick, then he unwound it—so it was like he had done nothing."
        }
      ],
      "glosses": [
        "When \"un\" is added to the front of a verb it means to do something in reverse. That is, put something back the way it was before."
      ],
      "id": "simple-un--en-prefix-gLBIuNSc"
    }
  ],
  "sounds": [
    {
      "ipa": "en",
      "tags": [
        "Canada",
        "UK",
        "US"
      ]
    },
    {
      "ipa": "/an/",
      "tags": [
        "Australia"
      ]
    },
    {
      "audio": "en-us-un-.ogg",
      "tags": [
        "US"
      ]
    }
  ],
  "word": "un-"
}

{
  "forms": [
    {
      "form": "un-",
      "raw_tags": [
        "Prefix"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "prefix"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "senses": [
    {
      "examples": [
        {
          "text": "You could say, \"He is not happy\", \"He is unhappy\", or \"He is sad\"."
        }
      ],
      "glosses": [
        "You add \"un-\" to the front of an adjective or adverb usually to mean the opposite of the original word making an antonym."
      ]
    },
    {
      "examples": [
        {
          "text": "First he wound the string on the stick, then he unwound it—so it was like he had done nothing."
        }
      ],
      "glosses": [
        "When \"un\" is added to the front of a verb it means to do something in reverse. That is, put something back the way it was before."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "en",
      "tags": [
        "Canada",
        "UK",
        "US"
      ]
    },
    {
      "ipa": "/an/",
      "tags": [
        "Australia"
      ]
    },
    {
      "audio": "en-us-un-.ogg",
      "tags": [
        "US"
      ]
    }
  ],
  "word": "un-"
}