"insidiously" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "insidious",
        "3": "ly"
      },
      "expansion": "insidious + -ly",
      "name": "suffix"
    }
  ],
  "etymology_text": "insidious + -ly",
  "forms": [
    {
      "form": "more insidiously",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most insidiously",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "insidiously (comparative more insidiously, superlative most insidiously)",
      "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"
        }
      ],
      "glosses": [
        "in an insidious manner"
      ],
      "id": "en-insidiously-en-adv-Cow9G2od",
      "links": [
        [
          "insidious",
          "insidious"
        ]
      ],
      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "sense": "in an insidious manner",
          "word": "insidieusement"
        },
        {
          "code": "ka",
          "lang": "Georgian",
          "roman": "ešmaḳurad",
          "sense": "in an insidious manner",
          "word": "ეშმაკურად"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "in an insidious manner",
          "word": "insidiosamente"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "in an insidious manner",
          "word": "podstępnie"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɪnˈsɪdi.əsli/"
    }
  ],
  "word": "insidiously"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "insidious",
        "3": "ly"
      },
      "expansion": "insidious + -ly",
      "name": "suffix"
    }
  ],
  "etymology_text": "insidious + -ly",
  "forms": [
    {
      "form": "more insidiously",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most insidiously",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "insidiously (comparative more insidiously, superlative most insidiously)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "English 5-syllable words",
        "English adverbs",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms suffixed with -ly",
        "English terms with IPA pronunciation"
      ],
      "glosses": [
        "in an insidious manner"
      ],
      "links": [
        [
          "insidious",
          "insidious"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɪnˈsɪdi.əsli/"
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "in an insidious manner",
      "word": "insidieusement"
    },
    {
      "code": "ka",
      "lang": "Georgian",
      "roman": "ešmaḳurad",
      "sense": "in an insidious manner",
      "word": "ეშმაკურად"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "in an insidious manner",
      "word": "insidiosamente"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "in an insidious manner",
      "word": "podstępnie"
    }
  ],
  "word": "insidiously"
}