English Reference
adjective · adverb · noun

crazy

adj. · adv. · n.
US /ˈkɹeɪzi/ UK /kɹˈeɪzi/ crazy UK spelling crazies

  1. 01 A2 Elementary Informal

    adj.very strange, unusual, or foolish.

    adj.not sensible or logical; extremely foolish or strange.

    Simple

    It was a crazy idea to drive through the storm at night.

    In context

    The plan to launch the product without any prior testing seemed crazy to the rest of the board members.

  2. 02 A2 Elementary Informal

    adj.liking something or someone very much.

    adj.extremely enthusiastic or fond of a particular person, activity, or object.

    Simple

    My brother is crazy about football and never misses a game.

    In context

    She has been crazy about jazz since she was a teenager, spending most of her weekends at local clubs.

  3. 03 B1 Intermediate Informal

    adj.having a mind that does not work in a normal way.

    adj.suffering from a mental illness or being of unsound mind.

    Simple

    The old stories say a crazy man used to live in that house.

    In context

    The defendant's lawyers argued that he was crazy at the time of the incident to avoid a prison sentence.

    Usage

    Often considered offensive when used to describe people with clinical mental health conditions.

    Teacher's tip

    In modern English, using this word to describe mental illness is often seen as insensitive; advise students to use 'mentally ill' in serious contexts.

  4. 04 B1 Intermediate Informal

    adj.very busy, fast, or full of activity.

    adj.characterised by chaotic activity or extreme haste.

    Simple

    Work has been crazy lately with the new project starting.

    In context

    The atmosphere in the newsroom became crazy as the election results started pouring in from the coastal districts.

  5. 05 C1 Advanced SlangAmerican English

    adv.very or extremely.

    adv.used as an intensifier to mean 'to a great degree'.

    Simple

    That new video game is crazy expensive.

    In context

    The traffic on the bridge was crazy slow this morning due to the construction work.

  6. 06 C1 Advanced SlangInformal

    n.a person who behaves in a very strange or wild way.

    n.a person who is perceived as insane or highly eccentric.

    Simple

    Don't listen to him; he's just a crazy who shouts at cars.

    In context

    The local residents viewed the inventor as a bit of a crazy, despite his obvious technical brilliance.

    eccentriccrackpot

From craze (“to crush”) + -y, akin to being "crazed up". Compare cracked up (“suffered a mental breakdown; be insane”), crackpot. Compare typologically Russian чо́кнутый (čóknutyj).

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

This entry
Level A2 · Elementary
Frequency Very common
Updated