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I'm not sure about that vs I'm not so sure about that

Both phrases are correct and commonly used in English. The choice between “I'm not sure about that” and “I'm not so sure about that” depends on the speaker's desire to emphasize their level of uncertainty. Adding “so” in the second phrase adds slight emphasis to the uncertainty.
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Explained by Camille
Editor at TextRanch

Last updated: May 26, 2024 • 3696 views

I'm not sure about that

This phrase is correct and commonly used in English.

This phrase is used to express uncertainty or lack of confidence in a statement or situation.
  • You know what? I'm not sure about that.
  • No, I'm not sure about that.
  • Phillip: I'm not sure about that. I'm not sure but I believe there were two Ungano's gigs.
  • Evan, I'm not sure about that.
  • I'm not sure about that too, Miss.
  • I'm not sure about that holy part.
  • I'm not sure about that last one.
  • I'm not sure about that last one.
  • I'm not sure about that either.
  • I'm not sure about that.
  • I'm not sure about that hill, though.
  • I'm not sure about that carbo-load.
  • Well, I'm not sure about that.
  • I'm not sure about that.
  • No, I'm not sure about that.
  • I'm not sure about that.
  • I'm not sure about that bag on you.
  • No, I'm not sure about that at all.
  • I'm not sure about that, but you can try.
  • Sneakers and a shirt? I'm not sure about that.

Alternatives:

  • I'm uncertain about that
  • I'm not convinced about that

I'm not so sure about that

This phrase is correct and commonly used in English.

This phrase is also used to express uncertainty or lack of confidence, but the addition of 'so' adds a slight emphasis on the uncertainty.
  • I'm not so sure about that.
  • Actually, I'm not so sure about that now.
  • Mabel, I'm not so sure about that.
  • I'm not so sure about that.
  • We've done so much together, it seems like we should know everything there is to know about each other, but after hearing you talk about your mother before, I'm not so sure about that.
  • I'm not so sure about that.
  • I'm not so sure about that, brother.
  • I'm not so sure about that anymore.
  • I'm not so sure about that.
  • I'm not so sure about that.
  • And I'm not so sure about that skirt.
  • Erm, I'm not so sure about that.
  • Actually, I'm not so sure about that anymore.
  • I'm not so sure about that.
  • I'm not so sure about that.
  • I'm not so sure about that, Booth.
  • I'm not so sure about that one.
  • The robbery fits the Flash Squad's M.O. but murder, I'm not so sure about that.
  • I'm not so sure about that, Booth.
  • I'm not so sure about that "we," Nate.

Alternatives:

  • I'm not very sure about that
  • I'm not entirely convinced about that

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