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noxious - Poisonous or very harmful.

The subculture that Eddie was a member of was a noxious blend of drugs, music, and anarchy.

adjective

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flammable - Easily set on fire; capable of catching fire quickly.

Keep flammable materials away from open flames or heat sources.

adjective

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malignant - Dangerous and harmful, tending to produce death or deterioration – often describing something destructive or uncontrollably harmful.

The doctors were concerned the tumor might be malignant and might spread quickly, so they removed it.

noun

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precipice - A very sleep side of a cliff or a mountain.

At the top of the mountain, they gasped when they looked over the precipice in front of them.

verb

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decay - To gradually deteriorate or break down, becoming weaker and more damaged.

You couldn't see it from the outside, but the termites caused the house to decay from the inside until it just collappsed.

noun

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plight - A dangerous, difficult, or otherwise unfortunate situation

The plight of the jobless is slightly improved when they receive temporary unemployment benefits.

verb

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jeopardize - To endanger or threaten the success or safety of something.

Drinking and driving can jeopardize not only your own life but also the lives of others.

verb

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taint - To contaminate or pollute something.

In many third-world countries, tainted water is the only available drinking source despite its unhealthy effects.

adjective

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monstrous - Abnormally bad or shocking

The monstrous tidal wave destroyed the little island village.

adjective

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pernicious - Having a harmful effect, especially in a gradual or subtle way.

People used to think that smoking was good for you because it seemed calming, but now we realize that its pernicious effects are deadly over time.

adjective

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ominous - Giving the impression that something bad, unpleasant or threatening is going to happen.

The dark clouds overhead were an ominous sign that a storm was coming.

adjective

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rampant - Spreading unchecked or uncontrollably, especially in a way that causes harm or disruption, and that is excessive or widespread.

The spread of the virus was rampant, with cases increasing exponentially across the country.