English Reference
adjective · noun

belligerent

adj. · n.
US /bəˈɫɪdʒɝənt/ UK /bɪlˈɪdʒɹənt/ bel·liger·ent UK spelling belligerent's, belligerent's

  1. 01 C1 Advanced Formal

    adj.behaving in a very unfriendly and aggressive way, as if you want to start a fight or an argument.

    adj.exhibiting an aggressively hostile or combative attitude in social or professional interactions.

    Simple

    The customer became belligerent when the manager refused to give him a refund.

    In context

    The witness grew increasingly belligerent under cross-examination, responding to the lawyer's questions with sharp, defensive retorts.

    Teacher's tip

    In everyday English, this is most often used to describe someone who is angry and looking for a confrontation, often due to alcohol or stress.

  2. 02 C2 Proficiency FormalTechnical Law

    adj.belonging to a country or group that is currently fighting a war.

    adj.engaged in active warfare; specifically used in international law to describe nations at war.

    Simple

    The two belligerent nations finally agreed to meet for peace talks.

    In context

    International observers were sent to the border to ensure that neither belligerent party violated the terms of the ceasefire.

    Usage

    Often used in political or legal contexts to distinguish fighting parties from neutral ones.

  3. 03 C2 Proficiency FormalTechnical Law

    n.a person, group, or country that is taking part in a war.

    n.a state or other entity recognised as a participant in a conflict under international law.

    Simple

    The treaty required all belligerents to withdraw their troops from the disputed territory.

    In context

    The Geneva Conventions establish specific protections for non-combatants that must be respected by all belligerents in a conflict.

    Usage

    This noun form is almost exclusively found in academic, legal, or historical writing.

Kim, the North has become increasingly belligerent toward the South.

The New York Times· 17 Aug 2026

From Latin belligerans (“waging war”), present active participle of belligerō (“I wage war”), from belliger (“waging war, warlike”), from bellum (“war”) + -ger (from gerō (“I lead, wage, carry on”)).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level C1 · Advanced
Frequency Occasional
Updated