erratic, unpredictable and threatening - possibly motivated by uncontrolled primeval instincts - rage, hunger, lust or even madness
(You have to make the verb up first to develop the adjective. I started using it as a gerund to describe my new puppy's behaviour to friends. It is marvellously onomatopoeic as nobody seemed to have any trouble understanding it as an assumed existing word.)
the dog was a ravenning monster
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