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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.

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

adjective

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addictive - The habit-forming quality of a substance or activity that causes someone to become dependent on using it or doing it.

Nicotine is a highly addictive substance found in cigarettes.

noun

See verb

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plague - A persistent trouble or source of distress, often something that causes great suffering or difficulty.

The plague of locusts devastated the crops, leaving the farmers in desperate need of assistance.

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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taint - To contaminate or pollute something.

In many third-world countries, tainted water is the only available drinking source despite its unhealthy effects.

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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devastation - The state of being overwhelmed or ruined completely.

Wildfires swept through the forest, resulting in total devastation of wildlife habitats.

verb

See noun

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doom - Condemn to certain destruction or death

Devon's father told him that unless he improved his grades, he was doomed to a lifetime of poorly paid jobs.

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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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.

noun

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nosedive - A sudden, steep drop, a sharp decline in condition, success, or stability.

After the scandal, the company’s stock took a nosedive.