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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.

noun

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peril - Serious and immediate danger

Roger was aware of the peril of shark-infested waters, but he truly realized it when it was too late.

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.

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.

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

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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tremor - A slight shaking movement, such as one caused by an earthquake or instability; also a subtle or faint sign of emotion, such as fear or excitement in the voice or body.

Because he was nervous, his voice had a significant tremor during the presentation.

noun

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deadline - A specific time or date by which something must be completed.

She worked well under pressure and always met every deadline on time.

adjective

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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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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.

verb

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lurk - (of a person or animal) To be hidden so as to wait in ambush for someone or something

Artie lurked under his sister's bed so he could jump out and scare her when she least expected it.

noun

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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.