beast

US /biːst/
UK /biːst/
"beast" picture
1.

an animal, especially a large or dangerous four-footed one.

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The lion is a magnificent beast.
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He was attacked by a wild beast in the forest.
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animalcreaturebrute
2.

a cruel, violent, or uncivilized person.

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He acted like a complete beast, showing no mercy.
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Only a beast would treat someone like that.
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brutesavagemonsterfiendbarbarian
3.

something that is very difficult or unpleasant.

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This math problem is a real beast.
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Getting through that traffic was a beast.
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challengedifficultynuisancepain
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be the nature of the beast