[more aggressive; most aggressive]
1 : ready and willing to fight, argue, etc. : feeling or showing aggression
He started to get aggressive and began to shout.
an aggressive dog
2 : using forceful methods to succeed or to do something
an overly aggressive salesman
an aggressive lawyer whose tactics have made people angry
The team plays a very aggressive style of defense.
The company took aggressive steps to prevent illegal use of their equipment.
The publisher has been very aggressive in promoting the book.
The city began an aggressive campaign to encourage recycling.
a : very severe
an aggressive form of cancer
b : very strong or intense
— aggressively adverb
The company is aggressively promoting their products.
— aggressiveness noun [noncount]