I’m not quite sure vs I'm not so sure

Both phrases are correct and commonly used in English. They convey a similar meaning of uncertainty or lack of confidence. The choice between 'I'm not quite sure' and 'I'm not so sure' can depend on personal preference or the level of certainty the speaker wants to convey.

Last updated: April 06, 2024 • 842 views

I’m not quite sure

This phrase is correct and commonly used in English to express uncertainty or lack of confidence.

This phrase is used to indicate a lack of complete certainty about something. It is often used when the speaker is not entirely sure about a particular fact or decision.

Show examples from the web [+]

I'm not quite sure how to answer that question, sweetheart.
I'm not quite sure what this means but I think you ought to hear it.
I'm not quite sure how to get there.
With the time acceleration, I'm not quite sure.
I'm not quite sure, darling.
I already did a report, so I'm not quite sure why you're here.
You know, I think Natalie said something about that, - but I'm not quite sure.
I'm not quite sure how this works.
I'm not quite sure what you're talking about.
I'm not quite sure I understand.
No, I'm not quite sure.
Though I'm not quite sure what this place is.
I'm not quite sure what was going on.
I'm not quite sure how mother dies.
I'm not quite sure where they're from.
I'm not quite sure, sir.
'Cause I'm not quite sure what's going on here.
I'm not quite sure how he died, actually.
I'm not quite sure how all of that happened.
I'm not quite sure why I'm here.

Alternatives:

I'm not entirely sure
I'm not completely sure
I'm not totally sure
I'm not absolutely sure
I'm not 100% sure

I'm not so sure

This phrase is correct and commonly used in English to convey uncertainty or lack of confidence.

This phrase is used to express doubt or lack of conviction about something. It is often used when the speaker is hesitant or skeptical about a statement or decision.

Show examples from the web [+]

I'm not so sure... after only one battle.
I'm not so sure, Samuel.
I'm not so sure anyone will.
I'm not so sure Sam can.
I'm not so sure, Barb.
I'm not so sure, Ronon.
I'm not so sure, Doc.
I'm not so sure, Lois.
This time, I'm not so sure.
I'm not so sure Declan's a criminal.
I'm not so sure it's unnecessary...
Now I'm not so sure if he's listening.
Frankly, I'm not so sure.
Granger I'm not so sure about.
I'm not so sure this is quite the issue.
No, I'm not so sure.
On Blade, I'm not so sure.
I'm not so sure about the neighbors.
I'm not so sure about all this.
I'm not so sure of his intentions.

Alternatives:

I'm not very sure
I'm not that sure
I'm not completely sure
I'm not entirely sure
I'm not totally sure

What Our Customers Are Saying

Our customers love us! We have an average rating of 4.79 stars based on 283,125 votes.
Also check out our 2,100+ reviews on TrustPilot (4.9).

"Amazing! I like that the editors are REAL people and not A.I., like some use. The editors actually see clients as real people and not just apart of their job, and it shows. 💖"
moggie April 2025
"TextRanch has been a great help to me, especially at work because I often email my boss."
Jhey April 2025
"Thank you!"
Sachi Nakama July 2024
"I have literally been through chat, PI, claude, bard and bing and I got conflicting answers! Thank you! Human intelligence reigns!"
Retha July 2024
"Faster than AI"
CYNTHIA December 2023
"This was very helpful and I personally think this site is the best."
Kaden October 2023
"It was extremely thorough and very helpful!"
imperialelisa October 2023
"7 years without any disappointment. Always 100% satisfied. You guys are the best in the world at what you do. Thank you so much :)"
Zubair Alam October 2023
"In a world of text messages and online communication, this is great to have as a live tool. Thank you."
Selena October 2023
"Without textranch I would be stuck!"
宏祐 October 2023
"Accuracy and fast response. Personal comments from editor. Thank you."
Clh September 2023
"I wasn't aware of this service, it's fascinating and more reliable than standard IA tools available on the internet"
Arturo September 2023
"The fact that you can get reliable fast feedback on your texts."
Vinicius Antonio August 2023
"you guys are better than grammarly i'm being honest here"
ordinary July 2023
"OMG! This is really good than any other text correction tools I've used so far. Highly recommend this."
Vehan July 2023
"Very fast and accurate. thank you."
mojtaba July 2023
"I love this app because it's help to writing skills all of students ♥️"
Tarisini July 2023
"This was exactly the mistake I was looking for, the wording dind´t sound right at first. Better than grammarly!"
Ente July 2023
"The immediate help that I received was reassuring and very satisfactory. Thanks."
priiiyanshuu July 2023
"this helps A LOT for my studies."
kathnunez02 June 2023
"Woow!! I would never have expected such precision! Thank you soooo much!!"
Berta June 2023
"Real Time Editor and not AI. Many Thanks."
Priya June 2023
"The very first thing excites me about Textranch is how much your editors care."
sepideh June 2023
"The fact that texts are checked by human editors rather than by AI, etc. I appreciate this!"
Анна June 2023