"not half bad" meaning in English

{
  "etymology_templates": [
    {
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        "2": "not bad"
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      "expansion": "not bad",
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    {
      "args": {
        "1": "en",
        "2": "not half"
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      "expansion": "not half",
      "name": "m"
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  ],
  "etymology_text": "Variant of not bad. Cf. also not half.",
  "head_templates": [
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      "args": {
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      "expansion": "not half bad (not comparable)",
      "name": "en-adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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      "examples": [
        {
          "text": "It was his first attempt at cooking, but I tried it and it was not half bad.",
          "type": "example"
        }
      ],
      "glosses": [
        "Pretty good, imperfect but more than OK."
      ],
      "id": "en-not_half_bad-en-adj-AuaCby94",
      "links": [
        [
          "Pretty",
          "pretty"
        ],
        [
          "good",
          "good"
        ],
        [
          "imperfect",
          "imperfect"
        ],
        [
          "more",
          "more"
        ],
        [
          "OK",
          "OK"
        ]
      ],
      "raw_glosses": [
        "(idiomatic, litotes) Pretty good, imperfect but more than OK."
      ],
      "synonyms": [
        {
          "word": "satisfactory"
        }
      ],
      "tags": [
        "idiomatic",
        "not-comparable"
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "imperfect but more than OK",
          "word": "halb so schlimm"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "ne takój už ploxój",
          "sense": "imperfect but more than OK",
          "tags": [
            "masculine"
          ],
          "word": "не тако́й уж плохо́й"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-not half bad.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/a/a2/En-au-not_half_bad.ogg/En-au-not_half_bad.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/a/a2/En-au-not_half_bad.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "not half bad"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "not bad"
      },
      "expansion": "not bad",
      "name": "m"
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    {
      "args": {
        "1": "en",
        "2": "not half"
      },
      "expansion": "not half",
      "name": "m"
    }
  ],
  "etymology_text": "Variant of not bad. Cf. also not half.",
  "head_templates": [
    {
      "args": {
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      "expansion": "not half bad (not comparable)",
      "name": "en-adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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        "English uncomparable adjectives"
      ],
      "examples": [
        {
          "text": "It was his first attempt at cooking, but I tried it and it was not half bad.",
          "type": "example"
        }
      ],
      "glosses": [
        "Pretty good, imperfect but more than OK."
      ],
      "links": [
        [
          "Pretty",
          "pretty"
        ],
        [
          "good",
          "good"
        ],
        [
          "imperfect",
          "imperfect"
        ],
        [
          "more",
          "more"
        ],
        [
          "OK",
          "OK"
        ]
      ],
      "raw_glosses": [
        "(idiomatic, litotes) Pretty good, imperfect but more than OK."
      ],
      "tags": [
        "idiomatic",
        "not-comparable"
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    }
  ],
  "sounds": [
    {
      "audio": "En-au-not half bad.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/a/a2/En-au-not_half_bad.ogg/En-au-not_half_bad.ogg.mp3",
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      "tags": [
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  ],
  "synonyms": [
    {
      "word": "satisfactory"
    }
  ],
  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "imperfect but more than OK",
      "word": "halb so schlimm"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "ne takój už ploxój",
      "sense": "imperfect but more than OK",
      "tags": [
        "masculine"
      ],
      "word": "не тако́й уж плохо́й"
    }
  ],
  "word": "not half bad"
}

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  "msg": "unrecognized sense qualifier: idiomatic, litotes",
  "path": [
    "not half bad"
  ],
  "section": "English",
  "subsection": "adjective",
  "title": "not half bad",
  "trace": ""
}

{
  "called_from": "form_descriptions/1831",
  "msg": "unrecognized sense qualifier: idiomatic, litotes",
  "path": [
    "not half bad"
  ],
  "section": "English",
  "subsection": "adjective",
  "title": "not half bad",
  "trace": ""
}