aggressor

noun

ag·​gres·​sor ə-ˈgre-sər 

: one that commits or practices aggression

Synonyms of aggressor

• invader
• raider
• attacker

Examples of aggressor in a Sentence

Each country accused the other of being the aggressor.

a group of smaller states had formed an alliance to deter potential aggressors

Recent Examples on the Web

Exhibited for the first time outside of Sarajevo, the churning Socialist Realist homage invokes Eugène Delacroix’s Liberty Leading the People in figuring partisans heroically overcoming their would-be Nazi aggressors. — Ara H. Merjian, ARTnews.com, 10 July 2026

The skin isn’t just a passive barrier that accepts humectants, peptides, and other ingredients and keeps out external aggressors like pollutants and bacteria. — Deanna Pai, Vogue, 6 July 2026

This helps nourish and protect hair from external aggressors like UV damage and pollution, which can cause weakness and buildup. — Ariana Yaptangco, Glamour, 5 July 2026

The person raising an issue is framed as the aggressor, while the other partner consistently avoids accountability. — Mark Travers, CNBC, 5 July 2026

Word History

Etymology

borrowed from Latin, "attacker, assailant," from aggredī, adgredī "to approach, attack" + -tor, agent suffix — more at aggress

First Known Use

1585, in the meaning defined above

Rhymes for aggressor

• assessor
• compressor
• confessor
• depressor
• hairdresser
• necessar
• oppressor
• possessor
• processor
• professor
• repressor
• successor

Kids Definition

aggressor

noun

ag·​gres·​sor ə-ˈgres-ər 

: a person or country that attacks without reasonable cause

Medical Definition

aggressor

noun

ag·​gres·​sor ə-ˈgres-ər 

: one who exhibits aggression