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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 fairly sure
Grammar usage guide and real-world examples

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

59 human-written examples

I'm fairly sure they died.

News & Media

The New York Times

I'm fairly sure we didn't.

News & Media

The Guardian - Sport

I'm fairly sure you're not dead.

News & Media

The Guardian - Sport

I'm fairly sure I went to Xq28 once.

News & Media

The Guardian - Opinion

I'm fairly sure it's something I'll have to live with.

News & Media

The Guardian

In fact, I'm fairly sure I have said the same.

News & Media

The Guardian

It made sense at the time, I'm fairly sure.

News & Media

The Guardian

I'm fairly sure book sales are rigorously audited.

News & Media

The Guardian - Books

I'm fairly sure it was a mistake – but it certainly made my dinner party guests happy.

News & Media

Independent

"Christ would not have taught the disciples by correspondence course, I'm fairly sure".

News & Media

The New York Times - Books

I'm fairly sure, however, that Blass himself didn't design that coat, at least, I hope not.

News & Media

The New Yorker

Expert writing Tips

Best practice

In professional emails, use this phrase to provide updates on non-critical tasks where absolute verification isn't yet available but a quick response is needed.

Common error

Avoid using "I'm fairly sure" in scientific or technical documentation where precision is required; use data-driven phrases like "the results indicate" instead.

Antonio Rotolo, PhD

Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Source & Trust

96%

Authority and reliability

4.9/5

Expert rating

Real-world application tested

Linguistic Context

The phrase "I'm fairly sure" serves as a modal qualifier or an epistemic hedge. It modifies the speaker's commitment to the truth of a statement. According to Ludwig examples, it allows a speaker to make a claim while providing a social buffer against being wrong.

Expression frequency: Very common

Frequent in

News & Media

85%

General Discourse

10%

Opinion Pieces

Less common in

Scientific Research

Legal Documents

Academic Papers

Ludwig's WRAP-UP

The phrase "I'm fairly sure" is a linguistic staple for expressing high-level confidence with a human touch. Ludwig AI analysis shows it is extensively used by professional writers to soften assertions and acknowledge the limitations of memory or data. While it is functionally equivalent to "I'm pretty sure", it maintains a slightly more sophisticated profile that makes it suitable for broad media consumption. It is most effective when used in neutral contexts where the speaker wants to project both authority and humility.

More alternative expressions(10)

Phrases that express similar concepts, ordered by semantic similarity:

I'm fairly certain

Uses a slightly more formal adjective than sure

I'm reasonably sure

Swaps fairly for a more measured adverb

I'm pretty sure

More informal and colloquial in tone

I'm quite sure

Suggests a higher level of emphasis, particularly in British English

I'm fairly confident

Shifts the focus from external facts to personal feeling

I'm relatively certain

More academic and precise in its qualification

I'm fairly convinced

Implies the speaker was persuaded or reached a conclusion

I'm almost positive

Expresses a higher degree of certainty

I'm fairly comfortable

Focuses on the speaker's ease with a conclusion

I suspect that

Significantly more speculative and less certain

FAQs

How do I use "I'm fairly sure" in a sentence?

You can use it to introduce a belief, such as "I'm fairly sure we met before" or as a standalone confirmation.

Is it better to say "I'm fairly sure" or "I'm pretty sure"?

It depends on the level of formality. "I'm fairly sure" sounds slightly more polished, while "I'm pretty sure" is more common in casual conversation.

What can I say instead of "I'm fairly sure" in a formal report?

In formal contexts, it is better to use "I'm reasonably certain" or "it is highly probable that" to sound more objective.

Does "I'm fairly sure" mean 100% certainty?

No, it implies about 80-90% certainty. If you are 100% certain, you should say "I'm positive" or "I'm certain".

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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

96%

Authority and reliability

4.9/5

Expert rating

Real-world application tested

Most frequent sentences:

1-200 1k 2k 3k 4k 5k 7k 10k 20k 40k 100k 200k 500k 0m-3 0m-4 1m-1 1m-2 1m-3 1m-4

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

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