Is not rocket science formal or informal?

It is informal. People use it in speech, emails, and casual writing.

Can I use not rocket science in business writing?

Yes, but only in a friendly, relaxed style. Avoid it in very formal reports.

Does not rocket science sound rude?

It can sound rude if it is used to criticise someone. Use it carefully.

What is a more neutral way to say it?

You can say 'easy', 'simple', or 'straightforward' instead.

← Dictionary

not-rocket-science

/nɒt ˌrɒk.ɪt ˈsaɪ.əns/

IELTSAcademic

idiom

Used to say that something is not very difficult to understand or do. It suggests the task is simpler than people think.

Using the new app is not rocket science.
Cooking rice is not rocket science.
This report is not rocket science.

Adinary Nuance

Use not rocket science when you want to sound casual and reassuring. It is stronger and more idiomatic than easy, and less direct than simple. Writers often use it to reduce fear or stress about a task. It can sound dismissive if you use it about someone else's problem.

In other languages

Vietnamese: không khó
Spanish: no es difícil
Chinese: 没那么难
Japanese: そんなに難しくない
Korean: 별로 어렵지 않다

Etymology

This phrase comes from the idea that rocket science is very complex. It became common in modern English as a casual way to say something is easy.

Common phrases

It’s not rocket scienceThat’s not rocket scienceThis isn’t rocket science

Synonyms

easy simple straightforward painless

Frequently asked questions

Is not rocket science formal or informal?: It is informal. People use it in speech, emails, and casual writing.
Can I use not rocket science in business writing?: Yes, but only in a friendly, relaxed style. Avoid it in very formal reports.
Does not rocket science sound rude?: It can sound rude if it is used to criticise someone. Use it carefully.
What is a more neutral way to say it?: You can say 'easy', 'simple', or 'straightforward' instead.