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abyss - A deep or seemingly bottomless hole or chasm.

He stood at the cliff's edge, staring into the black abyss, and he felt a mixture of awe, fear, and amazement.

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inferno - A large fire that is dangerously out of control

The raging inferno that was consuming the forest would be a big challenge for the firefighters.

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outbreak - A sudden start or increase of something harmful, especially a disease or conflict.

The outbreak of the flu led to school closures across the region.

adjective

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incendiary - Likely to cause fire, violence, strong feelings, or anger.

The prison riot started when some prisoners shouted incendiary remarks in the cafeteria about how awful their living conditions were.

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fatal - Something that can cause death.

Since Martha was a diabetic, she knew that eating that piece of strawberry shortcake could be a fatal mistake.

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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.

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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.

noun

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beast - Something or somebody very difficult or unpleasant to deal with.

He acted like a beast when he lost his temper, and shouted at the top of his lungs and threw dishes.

noun

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casualty - A person killed or injured in a war or accident.

Though many people were injured when the bus crashed, thankfully there were no casualties.

adjective

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caustic - Sarcastic or severely critical, often in a hurtful or biting manner; or able to burn or corrode organic tissue, typically referring to chemicals or substances.

The caustic chemical spilled onto the floor and quickly started to eat away at the floor surface.

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

Keep flammable materials away from open flames or heat sources.

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deluge - A severe flood or overwhelming rush of water.

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