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meltdown - A sudden and complete failure, especially in a system or process

The safety system was designed to prevent a nuclear meltdown in case of an emergency.

adjective

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thorny - Causing distress, difficulty, or trouble.

The negotiating teams were up all night trying to resolve some final thorny issues that had to be resolved.

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.

adjective

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treacherous - Hazardous or extremely dangerous conditions.

The already dangerous road on the narrow mountain pass was made even more treacherous by the high incidences of rock falls.

noun

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beast - Something or somebody very difficult or unpleasant to deal with.

He acted like a beast when he lost his temper, and shouted at the top of his lungs and threw dishes.

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.

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.

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.

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.

verb

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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.

noun

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hysteria - A state of extreme excitement, fear or anger in which a person, or a group of people, loses control of their emotions and starts to cry, laugh, etc.

There was almost mass hysteria when the band played their final song and some in the crowd rushed towards the stage.

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.