not certain whether

USAGE SUMMARY

The phrase "not certain whether" is correct and usable in written English.
You can use it when you are unsure about something and would like to express your uncertainty. For example: "I'm not certain whether I will be able to attend the meeting tomorrow."

✓ Grammatically correct

News & Media

Encyclopedias

Science

Human-verified examples from authoritative sources

Exact Expressions

58 human-written examples

"It is not certain whether this is unusual".

The New York Times

It is not certain whether foul play was involved...

The New York Times

Psychiatrists are not certain whether sleep problems are a potential cause or a symptom of depression.

The New York Times - Health

It is still not certain whether Mr. Negroponte will succeed in his crusade.

The New York Times

He said he was not certain whether he would push for any tax cuts.

The New York Times

Now, I'm not certain whether the music of Louis Armstrong actually saved my life.

The Guardian - Music

It is currently not certain whether or not the administrators will be appointed.

The Guardian - Business

"I wasn't certain, and I'm still not certain, whether I wanted children," she says.

The New Yorker

Dr. Samuels is not certain whether he will have another artificial heart patient.

The New York Times - Science

It is not certain whether the late Cardinal Basil Hume told the rule-breaker to desist.

The Guardian

It is not certain whether he died there from the injury or near Pisa by suicide.

Encyclopedia Britannica

Expert writing Tips

Best practice

When using "not certain whether", ensure the sentence structure clearly presents the two or more possibilities you are considering.

Common error

Avoid using "not certain whether" when you already have clear evidence or information. The phrase indicates genuine uncertainty, not a rhetorical question or sarcasm.

Linguistic Context

The phrase "not certain whether" functions as a conjunction phrase expressing uncertainty or doubt about a particular condition or outcome. Ludwig AI confirms its correct usage, as demonstrated in numerous examples across diverse contexts.

Expression frequency: Very common

Frequent in

News & Media

42%

Encyclopedias

15%

Science

25%

Less common in

Wiki

10%

Formal & Business

5%

Reference

3%

Ludwig's WRAP-UP

The phrase "not certain whether" serves as a versatile tool for expressing doubt or uncertainty, finding widespread use across diverse contexts, as affirmed by Ludwig AI. Grammatically sound and frequently employed, it bridges formal and informal communication, though it's more prominent in news, scientific, and encyclopedic sources. While alternatives like "unsure if" exist, "not certain whether" maintains a professional tone. As Ludwig examples show, using this phrase accurately relies on understanding its correct application to express doubt, and not for statements where knowledge is already certain. Mastering its nuance ensures clarity and precision in your writing.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

uncertain if

A synonym for "not certain whether", using a single word to convey uncertainty.

not sure whether

Uses "not sure" as a more informal alternative to "not certain".

unsure if

Replaces "not certain whether" with a shorter, more direct expression of uncertainty.

it is unclear whether

Shifts the focus to the lack of clarity, rather than personal uncertainty.

doubtful whether

Substitutes "not certain" with "doubtful", emphasizing skepticism.

it remains to be seen whether

Emphasizes the passage of time needed to resolve the uncertainty.

it is yet to be determined whether

Similar to "it remains to be seen", but more formal.

open to question whether

Indicates that the matter is debatable or not definitively settled.

subject to doubt whether

Highlights the presence of doubt surrounding the issue.

not convinced that

Implies a lack of belief or persuasion regarding a particular outcome.

FAQs

How can I use "not certain whether" in a sentence?

Use "not certain whether" to express uncertainty about a condition or outcome. For example: "I am not certain whether the meeting will be held tomorrow."

What are some alternatives to "not certain whether"?

You can use alternatives like "unsure if", "doubtful whether", or "uncertain if" depending on the context.

Is it more formal to say "not certain whether" or "not sure whether"?

"Not certain whether" is generally considered more formal than "not sure whether". Use "not certain whether" in professional or academic writing, and "not sure whether" in more casual contexts.

What's the difference between "not certain whether" and "not sure if"?

While very similar, "not certain whether" typically introduces a more considered or formal statement of uncertainty, while "not sure if" is more conversational. Both express doubt about a particular situation.