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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.

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

See verb

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crack - A line on the surface of something where it has split without breaking apart.

She noticed a crack in the wall after the small earthquake.

noun

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pandemonium - Wild and noisy disorder or confusion; uproar

The release of the newest limited-edition sneakers led to pandemonium amongst the large crowd of shoppers.

noun

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precipice - A very sleep side of a cliff or a mountain.

At the top of the mountain, they gasped when they looked over the precipice in front of them.

verb

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jeopardize - To endanger or threaten the success or safety of something.

Drinking and driving can jeopardize not only your own life but also the lives of others.

noun

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malady - A disease or ailment

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

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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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

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fester - For negative feelings to get worse because they are not being dealt with

After their fight, Joan and David had a long talk to patch things up, because they didn't want to let any bad feelings fester.

noun

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upheaval - A sudden and dramatic change or disruption, especially one that causes confusion and societal disorder.

The economic downturn led to political upheaval and widespread unrest across the nation.

verb

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erupt - To explode suddenly after forces can't be held back any longer

After rumbling for a week, the volcano erupted spewing forth rivers of lava