A Crazy Synonym Guide — Definition, Antonyms, and Examples

Crazy‘ is one such English word that we hardly think of replacing when speaking or writing. But the word can sometimes express a slightly offensive tone when used in some written pieces. Therefore, knowing the appropriate synonyms of the term will help use the correct word based on the context. Here’s a crazy synonym guide to help you learn its usage better, along with some frequently used synonyms and antonyms.

The Definition of Crazy

The word “crazy” comes from the word craze, which comes from the Middle English term crasen, meaning “become cracked” or “diseased.” Based on the English dictionary, the term ‘crazy’ functions as an adjective but can also serve as an adverb or noun.

‘Crazy’ is a slightly informal word that means a few different things based on context. It refers to an insane person who shows aggressive or wild behavior. The term also denotes anything strange or unusual. You may also use ‘crazy’ to refer to someone unable to reason or think logically. ‘Like crazy’ is an expression of being extremely enthusiastic.

Example Sentences:

  • Laura went crazy and started abusing her coworkers.
  • The loud construction noise has been driving me crazy since morning.
  • These crazy drivers on the streets are the reasons for the accidents.
  • She dyed her hair in some crazy pink and yellow color.
  • I am crazy about rock concerts.
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Crazy Synonym — Exploring Words with Similar Meanings

Some crazy synonym examples are mad, insane, deranged, demented, lunatic, unbalanced, unhinged, and unstable. Other words with similar meaning include passionate, fanatical, excited, wild, mad, nuts, and smitten with.


It comes from the Old English word gemædde, which means “out of one’s mind.” The term is mostly used in an informal context and refers to a very angry person. It could also mean being very enthusiastic about something. In general terms, it refers to a person showing multiple mental illnesses.

  • She was mad at me for giving away her childhood toys.
  • He is a mad fan of football.


‘Insane’ is a close synonym of ‘crazy’ with a more formal undertone. The term comes from the Latin insanus, where in- means “not” + sanus means “healthy.” Insane refers to a mental state that hinders normal behavior or social engagement. In the US, the term is informally used to mean something outrageous.

  • She was driving on the road at an insane speed.
  • He went insane and started thinking everyone would harm him.


‘Absurd’ originates from the Latin term absurdus, meaning “out of tune,” and it also relates to surdus, meaning “deaf” or “dull.” The word ‘absurd’ refers to something extremely unreasonable, foolish, or illogical.

  • All his allegations were utterly absurd.
  • I don’t want to be involved in an absurd argument.


‘Strange’ comes from the Old French term estrange and Latin extraneus, meaning “external, strange.” The term refers to something different that is not usual or expected. It also means something which was not previously seen, heard, or encountered.

  • I knew she wasn’t from here because her language was very strange.
  • I have noticed strange behavior in the child.


‘Deranged’ originates from the French déranger and Old French desrengier, which means “move from orderly rows.” The term ‘deranged’ refers to someone who cannot think normally or act sensibly due to mental illness.

  • The deranged criminals are in custody.
  • A deranged fan of the musician created chaos on the stage.

Crazy Antonyms — Exploring Words with Opposite Meanings


‘Sane’ originates from Latin sanus, meaning “sound or healthy.” The term refers to a sound state of mind where a person thinks and acts reasonably.

  • A sane person can’t do such a horrific act.
  • The short trips are only keeping me sane from the hectic work schedule.


The word ‘calm’ originates from the Old French calme and carme, meaning “stillness, quiet, tranquility.” It refers to a state where a person does not show any feeling of anger, nervousness, or any other strong emotions.

  • She is a very calm and composed lady.
  • You should stay calm in the face of adversity.


‘Collected’ originated from the Old French collecter or medieval Latin collectare and collect- which means “gathered together.” The term refers to a person having control and calmness in nature.

  • He was very cool and collected during the presentation.
  • Decide with a calm and collected mind.


‘Reasonable’ is derived from the Old French raisonable and Latin rationabilis, meaning “logical or rational.” The term refers to the ability to make a sound judgment. A reasonable person ensures good and fair judgment.

  • I believe she will make a reasonable choice.
  • She made a reasonable request for the leave.


‘Rational’ comes from the Latin rationalis, derived from ratio(n-), meaning “reckoning, reason.” The term refers to the ability of a person to think clearly in accordance with logic. A rational person decides based on logic, not on impulse.

  • You should give me a rational explanation for your actions.
  • I was too upset to make any rational decision.

To Wrap Up

This crazy synonym guide is meant to enhance your vocabulary knowledge and express your thought better. Whether you’re writing casually or formally, choose the right word based on the tone and usage to convey the correct message.

Pam is an expert grammarian with years of experience teaching English, writing and ESL Grammar courses at the university level. She is enamored with all things language and fascinated with how we use words to shape our world.

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