"treacherously" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "treacherous",
        "3": "ly"
      },
      "expansion": "treacherous + -ly",
      "name": "suffix"
    }
  ],
  "etymology_text": "treacherous + -ly",
  "forms": [
    {
      "form": "more treacherously",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most treacherously",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "treacherously (comparative more treacherously, superlative most treacherously)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -ly",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with French translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Italian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Spanish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Swedish translations",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The former spy behaved treacherously."
        }
      ],
      "glosses": [
        "In a treacherous manner."
      ],
      "id": "en-treacherously-en-adv-9dMqnqoE",
      "links": [
        [
          "treacherous",
          "treacherous"
        ]
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "in a treacherous manner",
          "word": "kavalasti"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "in a treacherous manner",
          "word": "petollisesti"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "in a treacherous manner",
          "word": "traîtreusement"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "in a treacherous manner",
          "word": "proditoriamente"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "in a treacherous manner",
          "word": "subdolamente"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "in a treacherous manner",
          "word": "traidoramente"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "in a treacherous manner",
          "word": "förrädiskt"
        }
      ]
    }
  ],
  "word": "treacherously"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "treacherous",
        "3": "ly"
      },
      "expansion": "treacherous + -ly",
      "name": "suffix"
    }
  ],
  "etymology_text": "treacherous + -ly",
  "forms": [
    {
      "form": "more treacherously",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most treacherously",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "treacherously (comparative more treacherously, superlative most treacherously)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "English adverbs",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms suffixed with -ly",
        "Terms with Finnish translations",
        "Terms with French translations",
        "Terms with Italian translations",
        "Terms with Spanish translations",
        "Terms with Swedish translations"
      ],
      "examples": [
        {
          "text": "The former spy behaved treacherously."
        }
      ],
      "glosses": [
        "In a treacherous manner."
      ],
      "links": [
        [
          "treacherous",
          "treacherous"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "in a treacherous manner",
      "word": "kavalasti"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "in a treacherous manner",
      "word": "petollisesti"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "in a treacherous manner",
      "word": "traîtreusement"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "in a treacherous manner",
      "word": "proditoriamente"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "in a treacherous manner",
      "word": "subdolamente"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "in a treacherous manner",
      "word": "traidoramente"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "in a treacherous manner",
      "word": "förrädiskt"
    }
  ],
  "word": "treacherously"
}