Usually means: Harmful in a gradual, subtle way.
Definitions Related words Mentions History
We found 21 dictionaries that define the word insidiously:

General (17 matching dictionaries)
  1. insidiously: Merriam-Webster
  2. insidiously: Oxford Learner's Dictionaries
  3. insidiously: Collins English Dictionary
  4. insidiously: Vocabulary.com
  5. Insidiously, insidiously: Wordnik
  6. insidiously: Cambridge Advanced Learner's Dictionary
  7. insidiously: Wiktionary
  8. insidiously: Dictionary.com
  9. insidiously: Cambridge Essential American English Dictionary
  10. Insidiously: Wikipedia, the Free Encyclopedia
  11. insidiously: Rhymezone
  12. insidiously: Webster's 1828 Dictionary
  13. insidiously: FreeDictionary.org
  14. insidiously: Mnemonic Dictionary
  15. insidiously: TheFreeDictionary.com

Business (1 matching dictionary)
  1. insidiously: Legal dictionary

Medicine (3 matching dictionaries)
  1. insidiously: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. insidiously: Medical dictionary

(Note: See insidious as well.)

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Definitions from Wiktionary (insidiously)

▸ adverb:  in an insidious manner

Similar:
perniciously, insinuatingly, unsensibly, sinisterly, sneakily, undeviously, designingly, sneakishly, insinuatively, creepingly, more...

Opposite:
benign, harmless, inoffensive

Types:
deviously, underhanded, sneakily, furtively, secretly, more...

▸ Words similar to insidiously

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Similar:
perniciously, insinuatingly, unsensibly, sinisterly, sneakily, undeviously, designingly, sneakishly, insinuatively, creepingly, more...

Opposite:
benign, harmless, inoffensive

Types:
deviously, underhanded, sneakily, furtively, secretly, more...



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