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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.

noun

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heresy - An opinion or belief that contradicts established norms or accepted standards.

Galileo was once accused of heresy for claiming the Earth orbits the sun.

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.

noun

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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.

verb

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collide - What happens when a moving object hits something violently

The captain was totally surprised when the Titanic collided with the iceberg.

adjective

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precarious - Not safe and likely to fall or fail

Jill's spending habits were without bound, and as a result her financial situation was precarious.

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.

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.

adjective

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perilous - Full of danger or risk; hazardous.

The hikers took a perilous journey through the snow-covered mountains.

verb

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unleash - To release something powerful or intense, especially something that has been held back; to set free or allow something to happen without restriction.

The storm unleashed heavy rains and strong winds across the region.

verb

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fester - For negative feelings to get worse because they are not being dealt with

After their fight, Joan and David had a long talk to patch things up, because they didn't want to let any bad feelings fester.

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.