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

Keep flammable materials away from open flames or heat sources.

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.

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.

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.

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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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.

adjective

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disastrous - Leading to a complete failure or disaster, causing great damage or suffering

The hurricane had a disastrous effect on the small town.

noun

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tempest - A violent windy storm

The powerful tempest tossed the ship back and forth amongst the waves.

verb

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blast - To explode or destroy something or someone with explosives, or to break through or hit something with a similar, very strong force

While building the tunnel through the mountain, the construction crew blasted its way day by day until it was finished.

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

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malady - A disease or ailment

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