crazy

[ krey-zee ]

adjective

, cra·zi·er, cra·zi·est.

1. mentally deranged; demented; insane.

   Synonyms: lunatic, crazed

   Antonyms: sane

2. Informal. unpredictable, nonconforming, or odd:

   All I can say is she's the craziest person I know.

3. Informal. unusual; bizarre; singular:

   She always wears a crazy hat.

4. Informal. senseless; nonsensical; totally unsound:

   Surely you don’t plan to invest money in that crazy scheme!

   Synonyms: foolhardy, imprudent, foolish

5. Informal. extremely busy, hectic, chaotic, etc.:

   Yesterday was such a crazy day I hardly had time to eat.

6. Informal. intensely enthusiastic; passionately excited (usually followed by about or for ):

   Like many kids, he was crazy for baseball and yearned to be a professional ballplayer.

   Antonyms: dispassionate, cool

7. Informal. very enamored or infatuated (usually followed by about or for ):

   It's obvious he's just crazy about her.

8. Informal. intensely anxious or eager; impatient:

   I'm crazy to try those new skis.

9. Informal. very annoyed, frustrated, or bothered:

   It makes me crazy that some kids don't get a fair chance in life.

10. Informal. having an unusual, unexpected, or random quality, behavior, result, pattern, etc.:

    I'm back in Connecticut in a crazy twist of events, living in the same town where I grew up.

11. Slang. wonderful; excellent; perfect:

    That's crazy, man, crazy.

12. Archaic. likely to break or fall to pieces.

    Synonyms: passionate, impassioned, ardent

    Antonyms: stable

13. Archaic. weak, infirm, or sickly.

    Antonyms: healthy, strong

adverb

1. Informal. extremely; madly:

   December is a crazy busy month for us.

   That new clothing store is crazy popular with teenage girls.

noun

, plural cra·zies.

1. a person who is mentally deranged or insane.
2. Informal. an unpredictable, nonconforming person; oddball:

   Next door is a house full of crazies who wear weird clothes and come in at all hours.

3. the crazies, Informal. a sense of extreme unease, nervousness, or panic; extreme jitters:

   The crew was starting to get the crazies from being cooped up belowdecks for so long.

crazy

/ ˈkreɪzɪ /

adjective

1. informal.
   insane
2. fantastic; strange; ridiculous

   a crazy dream

3. informal.
   postpositive; foll by about or over extremely fond (of)
4. slang.
   very good or excellent

noun

1. informal.
   a crazy person

Derived Forms

• ˈcrazily, adverb
• ˈcraziness, noun

Other Words From

• cra·zi·ly adverb
• cra·zi·ness noun
• half-cra·zy adjective

Word History and Origins

Origin of crazy¹

First recorded in 1570–80; craz(e) + -y ¹

Idioms and Phrases

Idioms

1. like crazy, Informal.
   1. with great enthusiasm or energy; to an extreme:

      We shopped like crazy and bought all our Christmas gifts in one afternoon.

   2. with great speed or recklessness:

      He drives like crazy once he's out on the highway.

More idioms and phrases containing crazy

• drive someone crazy
• like crazy

Synonym Study

See mad.

Example Sentences

“I loved his voice and I loved the songs and I loved that he used to fly around the room like a crazy person,” Smith says.

From Los Angeles Times

"It just goes crazy - you could probably hear it in the UK - the sound of 90,000 people cheering and going crazy."

From BBC

Lai argued on Wednesday that he opposed violence and that advocating for Hong Kong independence was "too crazy to think about".

From BBC

Trump has dodged it, saying he wouldn’t have to use military force because Xi knew he was “crazy”, and he would impose paralysing tariffs on Chinese imports if that happened.

From BBC

McLean said, "He was the sixth member. Anything we got paid — anything we did, he got. Even though he wasn't lifting a finger and we were generating him so much money. It was crazy."

From Salon

Related Words

• absurd
• bizarre
• foolish
• goofy
• insane
• irresponsible
• ludicrous
• odd
• outrageous
• preposterous
• ridiculous
• silly
• strange
• weird