Bizarre vs That’s weird

When to use each in English, with meaning, register, and examples.

Bizarre

Top 2,000 (common)C1adjective

That’s weird

InformalTop 2,000 (common)
Most formal: Bizarre
 BizarreThat’s weird
Pronunciation🇬🇧 /["/bɪˈzɑː(r)/"]/🇺🇸 /["/bɪˈzɑːr/"]/🇬🇧 //ðæts wɪəd//🇺🇸 //ðæts wɪrd//
MeaningVery strange or unusual.That is strange or unusual.
Examplea bizarre situation/incident/storyThe lights flickered, and I thought, 'That’s weird.'
RegisterNeutralInformal
How commonTop 2,000 (common)Top 2,000 (common)
CEFR levelC1-
Part of speechadjective
Collocationsbe, look, seem, extremely, fairly, veryThat's weird timing, That's weird behavior, That's weird to say, That's weird, isn't it?, That’s weird for sure
Antonymsnormal, usual, common-
Common mistakesConfused with 'peculiar' — both mean strange, but 'peculiar' can imply a sense of uniqueness., Using 'bizarre' to describe regular events, it should be reserved for things that are unusually strange., Spelling mistakes like 'bizzarre' instead of 'bizarre'.Using in overly formal contexts., Confusing with 'That's strange' - similar but 'weird' has a stronger connotation., Not using the contraction (That's) - sounds more natural to shorten.
Usage notesUse 'bizarre' to describe things that are very odd or out of the ordinary. It's neutral, so it's appropriate in most contexts but may sound less formal in academic or serious writing.Use when something feels odd or unexpected; appropriate in casual contexts but can seem unprofessional in formal settings.

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That’s weird

Frequently asked questions: Bizarre vs That’s weird

What's the difference between Bizarre and That’s weird?

Bizarre: Very strange or unusual. That’s weird: That is strange or unusual.

Which is more formal: Bizarre and That’s weird?

Bizarre is the most formal of these.

Can you show an example of each?

Bizarre: a bizarre situation/incident/story That’s weird: The lights flickered, and I thought, 'That’s weird.'

Can I use Bizarre and That’s weird interchangeably?

Not always. Bizarre and That’s weird are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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