I'm not so sure about that — softly disagree
expressionB1IELTS 5+informalcommon
A gentle way to signal you disagree without flatly saying 'no'.
Pattern: I'm not so sure about that. / I'm not so sure (that) [clause].
In use
- Cheaper is always better? I'm not so sure about that.gently pushing back
- A: Everyone will love it, trust me.
B: Hmm, I'm not so sure about that.casual disagreement
Common mistake
✗ I'm not sure so about that.
✓ I'm not so sure about that.
Word order is 'not so sure'; 'so' goes before 'sure', not after.
Don't confuse it
More hedged than 'I see your point, but', which openly disagrees after conceding.