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English to English adjective
| 1 |
Quick; swift (to burn). |  | source: webster1913
| 2 |
Having the quality of injuring or killing; destructive; very mischievous; baleful; malicious; wicked. | | source: webster1913 adjective satellite
| 3 |
exceedingly harmful | | source: wordnet30
| 4 |
working or spreading in a hidden and usually injurious way | | Example: glaucoma is an insidious disease
a subtle poison
source: wordnet30
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