insidious - WordReference.com Dictionary of English

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- - insertion
  - inset
  - inshallah
  - inshore
  - inside
  - inside job
  - inside leg
  - inside out
  - insider
  - insider dealing
  - insidious
  - insight
  - insignia
  - insignificant
  - insincere
  - insinuate
  - insinuation
  - insipid
  - insist
  - insistent
  - insobriety
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insidious

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Concise Oxford English Dictionary © 2008 Oxford University Press:
insidious /ɪnˈsɪdɪəs/

▶adjective proceeding in a gradual, subtle way, but with harmful effects.

– derivatives
insidiously adverb,
insidiousness noun.

– origin C16: from L. insidiosus ‘cunning’.

'insidious' also found in these Oxford entries:

tentacle - undermine

Forum discussions with the word(s) "insidious" in the title:

slapped with an insidious and thoroughly modern gloss

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