English Reference
adjective · adverb

fierce

adj. · adv.
US /ˈfɪɹs/ UK /fˈiəs/ fierce

  1. 01 B2 Upper Intermediate

    adj.very violent, angry, or dangerous.

    adj.exhibiting or characterised by physical violence, ferocity, or aggression.

    Simple

    The hikers stayed away from the fierce dog guarding the farm gate.

    In context

    The fierce storm battered the coastline for three days, causing significant structural damage to the older wooden piers.

  2. 02 B2 Upper Intermediate

    adj.showing very strong feelings or a lot of energy.

    adj.marked by extreme intensity, power, or resolute activity.

    Simple

    There is fierce competition between the two local football teams.

    In context

    The candidate faced fierce opposition from within her own party regarding the proposed changes to the tax code.

  3. 03 C1 Advanced InformalSlang

    adj.looking very confident, powerful, and fashionable.

    adj.exhibiting exceptional quality, boldness, or an impressive personal presence.

    Simple

    She looked absolutely fierce in that bright red suit at the party.

    In context

    The model walked down the runway with a fierce expression that perfectly complemented the avant-garde collection.

    Usage

    Often used as a compliment in fashion or performance contexts.

    Teacher's tip

    This sense is highly positive in modern slang, particularly within LGBTQ+ and fashion communities, whereas the primary sense is often negative.

  4. 04 C2 Proficiency DialectInformalBritish English

    adv.used to mean 'very' or 'extremely'.

    adv.functioning as an intensifier meaning 'extremely' or 'very'.

    Simple

    It is fierce cold outside today, so make sure you wear a hat.

    In context

    The traffic was fierce heavy on the way into the city, delaying the start of the meeting by nearly an hour.

    Usage

    Commonly used in Irish English as an intensifier before an adjective.

    Teacher's tip

    This is a regional dialect use; learners should be aware of it when visiting Ireland but avoid using it in formal writing.

Usage fierce competition

But it has struggled to thrive in recent years amid fierce competition from online giants like Amazon, with sales stagnating.

BBC News· 6 Aug 2026

I admire its fierce independence: a woman stepping outside prescribed roles to pursue creativity on her own terms.

The Guardian· 31 Jul 2026

From Middle English fers, fiers, borrowed from Old French fers (“wild", "ferocious”), nominative of fer, from Latin ferus (“wild", "untamed”).

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

This entry
Origin Latin ferus
Level C1 · Advanced
Frequency Frequent
Updated