1) I am willing to admit if I don't know something.
2) I like to compliment others on their intellectual strengths.
3) I try to reflect on my weaknesses in order to develop my intelligence.
4) I actively seek feedback on my ideas, even if it is critical.
5) I acknowledge when someone knows more than me about a certain subject.
6) If someone doesn't understand my idea, it's probably because they aren't smart enough to get it. (reverse)
7) I sometimes marvel at the intellectual abilities of other people.
8) I feel uncomfortable when someone points out one of my intellectual shortcomings. (reverse)
9) I don't like it when someone points out an intellectual mistake that I made. (reverse)
Critique: I can see some confounding problems right away. When I was younger I was pretty painfully shy, so (4) I would not seek feedback, but not out of a lack of humility. Also (3) I don't get, because while I am extremely motivated by intellectual curiosity, I have maybe zero motivation to "develop my intelligence" like it was some kind of fitness thing. Also maybe I'm a wierdo but I don't think so much in terms of people being "smart", I think it is something you do. That is, it's hard work.
And with (8) and (9), it takes training to not feel uncomfortable or to not dislike it when someone points out your mistakes or shortcomings. I don't think that is really related to humility. In fact if you are super critical of yourself and judge yourself poorly compared to other people, you still hate it if anybody else points it out.