aggressive
adjective /əˈɡresɪv/
  /əˈɡresɪv/
- angry, and behaving in a threatening way; ready to attack
- Seals have been known to exhibit aggressive behaviour towards swimmers.
 - He became increasingly aggressive as the evening wore on.
 - He gets aggressive when he's drunk.
 - aggressive towards somebody She warned that her dog was aggressive towards strangers.
 
Extra ExamplesTopics Feelingsb2- a dangerous aggressive dog
 - Her mood became openly aggressive when his name was mentioned.
 - Watching violence on TV makes some children more aggressive.
 - As a teenager George was aggressive and moody.
 - It is important at all times to discourage aggressive behaviour in young children.
 
Oxford Collocations Dictionaryverbs- be
 - look
 - seem
 - …
 
- extremely
 - fairly
 - very
 - …
 
- towards/toward
 - with
 
 - (sometimes disapproving) determined and acting with force in order to succeed
- a very aggressive advertising campaign
 - aggressive in something We need to get more aggressive in our approach.
 - aggressive in doing something The firm is extremely aggressive in seeking new markets.
 
Extra ExamplesTopics Successb2- A good salesperson has to be aggressive in today's competitive market.
 - I was put off by his aggressive sales pitch.
 - He thrilled the crowd with his aggressive driving style on the track.
 - the company's highly aggressive marketing techniques
 
Oxford Collocations Dictionaryverbs- be
 - look
 - seem
 - …
 
- extremely
 - fairly
 - very
 - …
 
- towards/toward
 - with
 
 - (of a disease) developing quickly and difficult to treat 
- Doctors diagnosed her with a rare and aggressive cancer, which was feared to be incurable.
 
 - (of medical treatment) using all possible treatment options in order to extend somebody’s life 
- Nicholas was diagnosed with the rare disease in November and has undergone aggressive treatments since then.
 
 
Word Originearly 19th cent.: from Latin aggress- ‘attacked’ (from the verb aggredi) + -ive; compare with French agressif, -ive.