- 1. a. Quick; swift (to burn). Source: opted
- 2. a. Having the quality of injuring or killing; destructive; very mischievous; baleful; malicious; wicked. Source: opted
- 3. adj. exceedingly harmful Source: wordnet
- 4. adj. working or spreading in a hidden and usually injurious way Source: wordnet
- 5. j:100 s exceedingly harmful s working or spreading in a hidden and usually injurious way Source: ecdict
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pernicious
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From the definitions
exceedinglyharmfulhiddeninjuriousspreadingworkingbalefulburndestructiveinjuringkillingmaliciousmischievousqualityquickswiftwicked
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