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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.

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.

noun

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brinkmanship - The art or practice of pursuing a dangerous policy to the limits of safety before stopping, typically in politics

At the height of the Cold War, both sides engaged in a risky brinkmanship that nearly cost millions of lives.

noun

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malady - A disease or ailment

Smallpox was a very dangerous malady that has mostly been cured with vaccinations.

verb

See noun

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shock - To cause someone to feel surprised and upset.

He was shocked when he saw that his bank account was negative..

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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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

See verb

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breach - An act of breaking a law, rule, or agreement.

I didn't trust him after he shared my secret, in what I regarded as a breach of trust.

adjective

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volatile - An unstable situation that is likely to get worse quickly

Victor realized that he had created a volatile chemical that could easily explode if he wasn't very careful

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.

adjective

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reckless - Acting without thinking about the consequences, often in a dangerous or irresponsible manner.

The reckless behavior of the lead hikers, going much too close to the edge of the cliffs, put everyone in danger during the climb.

noun

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liability - Being legally responsible for something

After the car accident, the judge had to decide who had the greater liability for what happened.