Meaning of That's crazy
An expression of surprise or disbelief.
In simple words: That's unbelievable or surprising.
That's crazy in a sentence
- Did she really win the lottery? That's crazy!
- He quit his job without having another one lined up? That's crazy!
- You thought I could run a mile in under five minutes? That's crazy!
How to use That's crazy
Used in casual conversations to express disbelief or surprise, typically among friends. Avoid in formal settings or professional communication.
Grammar pattern
standalone expression
Memory hint
Think of a crazy person doing something unbelievable.

Related words
Collocations with That's crazy
- that's insane
- you can't be serious
- seriously, that's crazy
Synonyms for That's crazy
- that's unbelievable
- no way
- you've got to be kidding
Common mistakes with That's crazy
- Used in formal contexts where it's inappropriate.
- Confused with 'that's insane' — similar, but can imply more seriousness.
That's crazy appears in
That's crazy in other languages
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Frequently asked questions about That's crazy
What does That's crazy mean?
That's unbelievable or surprising.
What is the definition of That's crazy?
An expression of surprise or disbelief.
How do you use That's crazy in a sentence?
Did she really win the lottery? That's crazy!
Can you give another example of That's crazy?
He quit his job without having another one lined up? That's crazy!
What are synonyms for That's crazy?
Common alternatives include that's unbelievable, no way, you've got to be kidding.
What words go with That's crazy?
It commonly pairs with that's insane, you can't be serious, seriously, that's crazy.
What are common mistakes when using That's crazy?
Used in formal contexts where it's inappropriate. Confused with 'that's insane' — similar, but can imply more seriousness.
How do you pronounce That's crazy?
US: //ðæts ˈkreɪzi//, UK: //ðæts ˈkreɪzi//. Listen to the audio above to hear native pronunciation.
Is That's crazy formal or informal?
"That's crazy" is informal, so it fits casual conversation with friends and family.
When should I use That's crazy?
Used in casual conversations to express disbelief or surprise, typically among friends. Avoid in formal settings or professional communication.






