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destructive, devastating, ruinous, calamitous, disastrous, harmful, catastrophic, pernicious, wreckful, eradicative, wrackful | causing destruction or much damage | |
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insidious, pernicious, subtle | working or spreading in a hidden and usually injurious way | |
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deadly, baneful, pernicious, pestilent | exceedingly harmful | |
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mischievous, harmful, hurtful, detrimental, pernicious, noxious | deliberately causing harm or damage |