“Faith” is clearly defined in Hebrews 11:1. We would all love to have more faith, and it seems to me that the way to increase faith is to exercise the faith we already have. My journaling Bible is KJV; as a child, I memorized that translation of the verse.
I also like the NIV translation.
“Now faith is confidence in what we hope for and assurance about what we do not see.” (Hebrews 11:1, NIV)