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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak

CEO of Professional Science Editing for Scientists @ prosciediting.com

I'm reasonably sure
Grammar usage guide and real-world examples

Alternative expressions(7)

I'm fairly certain

I'm pretty sure

I am fairly certain

I have a strong feeling

I tend to believe

I'm inclined to think

As far as I can tell

Table of contents

Usage summary

Human-verified examples

Expert writing tips

Linguistic context

Ludwig's wrap-up

Alternative expressions

FAQs

Human-verified examples from authoritative sources

Exact Expressions

30 human-written examples

And I'm reasonably sure he didn't either.

News & Media

The New Yorker

I'm reasonably sure she'll never want to come home.

News & Media

The New York Times

"What was that?" "Well, I'm reasonably sure that he was a hemophiliac.

News & Media

The New Yorker

Oh, I'm reasonably sure that your daughter has no lingering effects from the premature delivery.

News & Media

The New York Times - Magazine

I'm reasonably sure that George Orwell would have answered, the latter.

News & Media

The New York Times

I'm reasonably sure, though, that such motivations would deserve little more respect than you show Rourke.

News & Media

The New York Times

Human-verified similar examples from authoritative sources

Similar Expressions

29 human-written examples

I was reasonably sure I could find another flower for Jane along the way.

News & Media

The New York Times

Nina is a Buddhist, and I am reasonably sure she means "in the instant," or "living in the instant".

News & Media

The New York Times

"At this moment," Dunford said, from his Harlem apartment, "I am reasonably sure they are in the bottom drawer of my nightstand".

News & Media

The New Yorker

I am reasonably sure that such contacts, such third-party interaction, such indirect contacts between India and Pakistan through intermediaries do help in defusing tension".

News & Media

The New York Times

"There is still a thing called good taste, and I am reasonably sure that I have already outraged it several pages ago," he admits as early as Page 20.

News & Media

The New York Times - Books

Expert writing Tips

Best practice

Use "I'm reasonably sure" when you want to express a moderate level of certainty without sounding overly assertive. It's suitable for situations where you have some evidence or reason to believe something, but you're not completely certain.

Common error

Avoid using "I'm reasonably sure" when you have strong evidence or are nearly certain of something. In such cases, a more definitive phrase like "I'm certain" or "I'm sure" would be more appropriate.

Antonio Rotolo, PhD

Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Source & Trust

90%

Authority and reliability

4.5/5

Expert rating

Real-world application tested

Linguistic Context

The phrase "I'm reasonably sure" functions as an assertion of belief or knowledge, conveying a moderate level of confidence. It introduces a statement that the speaker believes to be true, but without absolute certainty. Ludwig AI showcases several examples of its use in various contexts.

Expression frequency: Common

Frequent in

News & Media

75%

Science

15%

Formal & Business

Less common in

Encyclopedias

Wiki

Reference

Ludwig's WRAP-UP

In summary, the phrase "I'm reasonably sure" is a versatile expression used to convey a moderate level of certainty. Grammatically correct and commonly used, it's suitable for expressing opinions or judgments without absolute commitment. Ludwig AI shows that it appears frequently in news and media contexts, indicating its appropriateness for neutral and professional communication. While useful, remember to avoid overstating certainty when more definitive language is warranted.

More alternative expressions(6)

Phrases that express similar concepts, ordered by semantic similarity:

I am fairly certain

Replaces "reasonably" with "fairly", offering a slightly less formal tone.

I'm fairly confident

Substitutes "sure" with "confident", implying a belief based on evidence.

I'm pretty sure

Uses "pretty" instead of "reasonably", making it more informal.

I'm quite sure

Replaces "reasonably" with "quite", suggesting a slightly stronger level of certainty.

I'm fairly convinced

Uses "convinced" instead of "sure", suggesting a belief reached through reasoning.

I have a strong feeling

Emphasizes intuition rather than concrete evidence.

I tend to believe

Indicates a leaning towards a particular belief, without absolute certainty.

I'm inclined to think

Expresses a predisposition to a certain viewpoint.

It's my understanding

Indicates knowledge based on information received, rather than personal conviction.

As far as I can tell

Indicates a belief based on the available evidence, which may be incomplete.

FAQs

What does "I'm reasonably sure" mean?

The phrase "I'm reasonably sure" indicates a moderate level of certainty. It means you believe something is likely true, but you aren't completely positive. It's stronger than "I think" but weaker than "I'm certain".

When is it appropriate to use the phrase "I'm reasonably sure"?

Use "I'm reasonably sure" when you have some evidence or a strong feeling about something, but lack definitive proof. It's useful when providing an opinion or making a statement where you want to avoid sounding overly assertive.

What can I say instead of "I'm reasonably sure"?

You can use alternatives like "I'm fairly certain", "I'm pretty sure", or "I'm quite sure" depending on the context.

Is it better to say "I'm reasonably sure" or "I'm almost certain"?

"I'm reasonably sure" suggests a moderate level of confidence based on some evidence, while "I'm almost certain" implies a very high degree of confidence, just shy of absolute certainty. The best choice depends on how strongly you believe something to be true.

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Table of contents

Usage summary

Human-verified examples

Expert writing tips

Linguistic context

Ludwig's wrap-up

Alternative expressions

FAQs

Source & Trust

90%

Authority and reliability

4.5/5

Expert rating

Real-world application tested

Most frequent sentences:

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I'm reasonably sureGrammar usage guide and real-world examples

I'm reasonably sure
Grammar usage guide and real-world examples