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adjective

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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.

verb

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detonate - To cause something to explode suddenly and violently.

One small spark is enough to detonate a barrel of fireworks.

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.

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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rampant - Spreading unchecked or uncontrollably, especially in a way that causes harm or disruption, and that is excessive or widespread.

The spread of the virus was rampant, with cases increasing exponentially across the country.

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.

noun

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boobytrap - A seemngly harmless object containing a concealed explosive device designed to kill or injure anyone who touches it.

The army often sends dogs into abandoned houses just in case the enemy put boobytraps there that could explode.

verb

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splinter - To fragment or shatter, losing unity or cohesion.

The mirror fell and splintered into hundreds of tiny shards.

noun

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tempest - A violent windy storm

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

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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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.

verb

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loom - To appear as a dangerous event that might happen in the near future

Joe looked at the economic data, and could sense a recession looming in the near future.