English Reference
noun · adjective · verb

monster

n. · adj. · v.
US /ˈmɑnstɝ/ UK /mˈɒnstɐ/ mon·ster UK spelling monster's, monster's

  1. 01 A2 Elementary

    n.a scary, imaginary creature that is often large and dangerous.

    n.a mythical or fictional creature, typically of frightening appearance and malevolent nature.

    Simple

    The children believed a monster lived under their bed at night.

    In context

    Ancient maps often featured illustrations of sea monsters in unexplored waters to warn sailors of perceived dangers.

  2. 02 B2 Upper Intermediate

    n.a person who is extremely cruel, wicked, or heartless.

    n.a person of unnatural cruelty or wickedness whose actions evoke horror.

    Simple

    The dictator was a monster who treated his own people with terrible cruelty.

    In context

    The prosecutor described the defendant as a cold-blooded monster who showed no remorse for his crimes during the trial.

  3. 03 B1 Intermediate Informal Computing

    n.an enemy character that players fight in a video game.

    n.a non-player character (NPC) designed as a hostile opponent for players in role-playing or action games.

    Simple

    You need to defeat the forest monster to get the magic key.

    In context

    The game designer increased the monster's health points to ensure the final encounter remained challenging for high-level players.

  4. 04 B2 Upper Intermediate Informal

    adj.unusually large or powerful.

    adj.exceptionally large in size, power, or scale. Often used as an attributive adjective.

    Simple

    The band had a monster hit that stayed at number one for months.

    In context

    The company faced a monster deficit after the failed merger, forcing them to sell off several profitable subsidiaries.

  5. 05 C1 Advanced British EnglishInformal

    v.to criticize someone very strongly or to follow them around in an annoying way.

    v.to criticize, reprimand, or harass someone persistently. Often used in British or Australian contexts.

    Simple

    The newspapers started to monster the politician after the scandal broke.

    In context

    The coach was known to monster his players after a loss, pointing out every minor mistake they made on the field.

It opens with a scene of pure horror: it’s Halloween night and a real monster is hiding among the pretend ones.

The Guardian· 2 Sept 2026

The wild things – fictional monsters Sendak has said were based on his own family members – roll their terrible eyes, gnash their teeth and show their terrible claws.

The Conversation· 14 Aug 2026

From Middle English monstre, from Old French monstre, mostre, moustre, from Latin mōnstrum.

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

This entry
Origin Latin mōnstrum
Level B2 · Upper Intermediate
Frequency Common
Updated