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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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boobytrap - A seemngly harmless object containing a concealed explosive device designed to kill or injure anyone who touches it.

The army often sends dogs into abandoned houses just in case the enemy put boobytraps there that could explode.

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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.

noun

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doomsday - The end of the world, or a time when something very bad will happen, such as great destruction.

Those who are most concerned about global warming describe a doomsday future where coastal ciites will be under water.

noun

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devastation - The state of being overwhelmed or ruined completely.

Wildfires swept through the forest, resulting in total devastation of wildlife habitats.

verb

See noun

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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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deluge - A severe flood or overwhelming rush of water.

The heavy rain turned into a deluge, submerging cars and streets

verb

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shatter - To break or cause to break suddenly and violently into pieces

The force of the explosion shattered the glass windows.

verb

See noun

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doom - Condemn to certain destruction or death

Devon's father told him that unless he improved his grades, he was doomed to a lifetime of poorly paid jobs.

adjective

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monstrous - Abnormally bad or shocking

The monstrous tidal wave destroyed the little island village.

verb

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burst - To suddenly break apart, spilling its contents, usually as a result of internal pressure.

The old rusted water main under the street burst, causing the road above to flood.

noun

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meltdown - A sudden and complete failure, especially in a system or process

The safety system was designed to prevent a nuclear meltdown in case of an emergency.