1. characterized by or tending toward unprovoked offensives, attacks, invasions, or the like; militantly forward or menacing: aggressive acts against a neighboring country.
  2. making an all-out effort to win or succeed; competitive: an aggressive basketball player.
  3. vigorously energetic, especially in the use of initiative and forcefulness: an aggressive salesperson.
  4. boldly assertive and forward; pushy: an aggressive driver.
  5. emphasizing maximum growth and capital gains over quality, security, and income: an aggressive mutual fund.
  6. Medicine/Medical.
    1. (of a disease or tumor) spreading rapidly or highly invasive; difficult or impossible to treat successfully.
    2. pertaining to a risky surgery or treatment, or to a medication that has grave side effects: aggressive chemotherapy.


  1. quarrelsome or belligerentan aggressive remark
  2. assertive; vigorousan aggressive business executive

1791, from Latin aggress-, past participle stem of aggredi (see aggression) + -ive. In psychological use from 1913, first in translations of Freud. Related: Aggressively; aggressiveness.


  1. Characterized by aggression.
  2. Inclined to behave in a hostile fashion.
  3. Tending to spread quickly, as a tumor; fast-growing.
  4. Characterized by or inclined toward vigorous or intensive medical treatment.
54 queries 0.577