[ uh-gres-iv ]
/ əˈgrɛs ɪv /


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.
  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

SYNONYMS FOR aggressive

ANTONYMS FOR aggressive

Related forms

Can be confused

aggressive passive Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for aggressivity


/ (əˈɡrɛsɪv) /


quarrelsome or belligerentan aggressive remark
assertive; vigorousan aggressive business executive

Derived Forms

aggressively, adverbaggressiveness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for aggressivity


[ ə-grĕsĭv ]


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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.