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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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peril - Serious and immediate danger

Roger was aware of the peril of shark-infested waters, but he truly realized it when it was too late.

adjective

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flammable - Easily set on fire; capable of catching fire quickly.

Keep flammable materials away from open flames or heat sources.

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

See noun

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shock - To cause someone to feel surprised and upset.

He was shocked when he saw that his bank account was negative..

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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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.

noun

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casualty - A person killed or injured in a war or accident.

Though many people were injured when the bus crashed, thankfully there were no casualties.

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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noxious - Poisonous or very harmful.

The subculture that Eddie was a member of was a noxious blend of drugs, music, and anarchy.

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.

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.