feral
US /ˈfer.əl/
UK /ˈfer.əl/
1.
in a wild state, especially after escape from captivity or domestication
:
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The island is home to a large population of feral cats.
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We saw a pack of feral dogs roaming the streets.
2.
resembling a wild animal; especially in being fierce, cruel, or uncontrolled
:
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His eyes had a feral gleam as he stared at his opponent.
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The child let out a feral scream when he was denied the toy.