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

SYNONYMS FOR aggressive

1 pugnacious, militant.
2 forceful, enterprising, assertive.

ANTONYMS FOR aggressive

1 friendly.
2 retiring, shy, timid, hesitant.

OTHER WORDS FROM aggressive

WORDS THAT MAY BE CONFUSED WITH aggressive

aggressive passive

Words nearby aggressive

aggregation, aggregative, aggregator, aggress, aggression, aggressive, aggressive infantile fibromatosis, aggressive mimicry, aggressor, aggrieve, aggrieved

British Dictionary definitions for overaggressive (1 of 2)

overaggressive
/ (ˌəʊvərəˈɡrɛsɪv) /

adjective

excessively quarrelsome or belligerent

British Dictionary definitions for overaggressive (2 of 2)

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 overaggressive

aggressive
[ ə-grĕs′ĭv ]

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.