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onerous - Oppressively heavy or troublesome, often involving responsibility or duty.

The manager gave him an onerous task that took the entire week to finish, working late into each night.

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monstrous - Abnormally bad or shocking

The monstrous tidal wave destroyed the little island village.

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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.

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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tailspin - A rapid loss of control, a state of confusion, panic, or chaos, a sudden and dramatic decline or failure.

Because of engine trouble, the plane suddenly went into a tailspin, and the pilot struggled to regain control.

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

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

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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shatter - To break or cause to break suddenly and violently into pieces

The force of the explosion shattered the glass windows.

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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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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doomsday - The end of the world, or a time when something very bad will happen, such as great destruction.

Those who are most concerned about global warming describe a doomsday future where coastal ciites will be under water.