It is easy to find a simple dictionary definition of faith (like these), but because faith is such a central concept in Scripture, it is so much more than these simplistic (and often inaccurate) definitions. Real Christian faith, Gospel faith, is much greater than we tend to think.
A paradigm shift that I already experienced years ago (when I embraced Reformation theology) is taking me deeper. This understanding is the biblical perspective that faith has a lot more to do with God - the character of God, the grace of God, the work of God - than it does with us. Yes, we must exercise faith, but God is the author, the power and the object of true Christian faith.
Don't settle for simplistic conceptions of faith. Go deeper. Try to figure it out and how it applies to your life. It is a rewarding study.