ferocious

 
Pronunciation: /fəˈrəʊʃəs/

adjective

  • savagely fierce, cruel, or violent: a ferocious beast a ferocious battle
  • informal very great; extreme: a ferocious headache

Derivatives

ferociously

adverb

ferociousness

noun

Origin:

mid 17th century: from Latin ferox, feroc- 'fierce' + -ious