Usually means: Subtle and gradual harmful effect.
Definitions Related words Mentions History
We found 18 dictionaries that define the word insidiousness:

General (15 matching dictionaries)
  1. insidiousness: Merriam-Webster
  2. insidiousness: Oxford Learner's Dictionaries
  3. insidiousness: Collins English Dictionary
  4. insidiousness: Vocabulary.com
  5. insidiousness: Wordnik
  6. insidiousness: Cambridge Advanced Learner's Dictionary
  7. insidiousness: Wiktionary
  8. insidiousness: Dictionary.com
  9. insidiousness: Rhymezone
  10. insidiousness: Webster's 1828 Dictionary
  11. insidiousness: FreeDictionary.org
  12. insidiousness: Mnemonic Dictionary
  13. insidiousness: TheFreeDictionary.com

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

Medicine (2 matching dictionaries)
  1. insidiousness: Merriam-Webster Medical Dictionary
  2. insidiousness: Medical dictionary

(Note: See insidious as well.)

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Definitions from Wiktionary (insidiousness)

▸ noun:  A surreptitious harmfulness, quality of entrapment, or treacherousness; the characteristic of being insidious.

Similar:
insinuatingness, surreptitiousness, deviousness, surreptition, subtlety, sneakiness, insinuativeness, sneakishness, intrusiveness, treacherousness, more...

Opposite:
innocuous, harmless, benign

Types:
manipulation, deceit, subterfuge, sabotage, treachery, betrayal, duplicity, fraud, trickery, more...

Adjectives:
crafty, very, interested, natural, such, swift, soft, new, certain, less, real

▸ Words similar to insidiousness

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▸ Rhymes of insidiousness

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Similar:
insinuatingness, surreptitiousness, deviousness, surreptition, subtlety, sneakiness, insinuativeness, sneakishness, intrusiveness, treacherousness, more...

Opposite:
innocuous, harmless, benign

Types:
manipulation, deceit, subterfuge, sabotage, treachery, betrayal, duplicity, fraud, trickery, more...

Adjectives:
crafty, very, interested, natural, such, swift, soft, new, certain, less, real



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