aggressive

[ uh-gres-iv ]
/ əˈgrɛs ɪv /

adjective

characterized by or tending toward unprovoked offensives, attacks, invasions, or the like; militantly forward or menacing: aggressive acts against a neighboring country.
making an all-out effort to win or succeed; competitive: an aggressive basketball player.
vigorously energetic, especially in the use of initiative and forcefulness: an aggressive salesperson.
boldly assertive and forward; pushy: an aggressive driver.
emphasizing maximum growth and capital gains over quality, security, and income: an aggressive mutual fund.
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.

Origin of aggressive

First recorded in 1815–25; aggress(ion) + -ive

OTHER WORDS FROM aggressive

WORDS THAT MAY BE CONFUSED WITH aggressive

aggressive passive

Example sentences from the Web for aggressive

British Dictionary definitions for aggressive

aggressive
/ (əˈɡrɛsɪv) /

adjective

quarrelsome or belligerent an aggressive remark
assertive; vigorous an aggressive business executive

Derived forms of aggressive

aggressively, adverb aggressiveness, noun

Medical definitions for aggressive

aggressive
[ ə-grĕsĭv ]

adj.

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