1. characterized by aggression: aggressive behavior.
2. inclined to behave in an actively hostile fashion: an aggressive regime.
3. assertive, bold, and energetic: an aggressive sales campaign.
4. of or relating to an investment or approach to investing that seeks above-average returns by taking above-average risks.
5. fast growing; tending to spread quickly and invade: an aggressive tumor.
6. characterized by or inclined toward vigorous or intensive medical treatment: an aggressive approach to treating the infection.
7. intense or harsh, as in color.

1. tending or disposed to aggress; characterized by aggression; making assaults; unjustly attacking.

1. tending or disposed to aggress; having or showing determination and energetic pursuit of one's own ends at the expense of others or mindless of others' needs or desires; characterized by aggression; making assaults; unjustly attacking. opposite of
2. marked by self-confident ambition, competitiveness, energy and initiative.
3. tending to spread quickly.
4. characteristic of an enemy or one eager to fight.

1. characterized by aggression; tending to aggress; prone to begin a quarrel; making the first attack; offensive, as opposed to defensive: as, the minister pursued an aggressive foreign policy.
2.

1. having or showing determination and energetic pursuit of your ends
2. characteristic of an enemy or one eager to fight
3. tending to spread quickly