"樂觀" meaning in ベトナム語

{
  "categories": [
    {
      "kind": "other",
      "name": "ベトナム語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "ベトナム語_形容詞",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "lạc quan"
    }
  ],
  "lang": "ベトナム語",
  "lang_code": "vi",
  "pos": "adj",
  "pos_title": "形容詞",
  "senses": [
    {
      "glosses": [
        "楽観的な"
      ],
      "id": "ja-樂觀-vi-adj--0xcYdTe"
    }
  ],
  "word": "樂觀"
}

{
  "categories": [
    "ベトナム語",
    "ベトナム語_形容詞"
  ],
  "forms": [
    {
      "form": "lạc quan"
    }
  ],
  "lang": "ベトナム語",
  "lang_code": "vi",
  "pos": "adj",
  "pos_title": "形容詞",
  "senses": [
    {
      "glosses": [
        "楽観的な"
      ]
    }
  ],
  "word": "樂觀"
}