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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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collide - What happens when a moving object hits something violently

The captain was totally surprised when the Titanic collided with the iceberg.

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.

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

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tremor - A slight shaking movement, such as one caused by an earthquake or instability; also a subtle or faint sign of emotion, such as fear or excitement in the voice or body.

Because he was nervous, his voice had a significant tremor during the presentation.

verb

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blast - To explode or destroy something or someone with explosives, or to break through or hit something with a similar, very strong force

While building the tunnel through the mountain, the construction crew blasted its way day by day until it was finished.

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.

adjective

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ominous - Giving the impression that something bad, unpleasant or threatening is going to happen.

The dark clouds overhead were an ominous sign that a storm was coming.

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.

noun

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turmoil - A state of agitation or turbulence.

The turmoil caused by the rush of water going in all directions over the rapids was dangerous for swimmers.

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

See verb

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doom - Death, destruction, or some other terrible fate

Bryce struggled with his depression, unable to escape the constant feeling that doom and failure was just a moment away.