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insidious

audio pronunciation audio pronunciation
adjective
  • spreading or acting gradually and unnoticed but with harmful effects [Barron]
  • treacherous; stealthy; sly [Nandigam]

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Wiktionary:
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WordNet:
insidious @ wordnet.princeton.edu
Merriam-Webster Online:
insidious @ M-W.com
MSN Encarta:
insidious @ Encarta
American Heritage Dictionary of the English Language:
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Answers.com:
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