Essentially, pride is a "my will" rather than "thy will" approach to life. Pride is characterized by "What do I want out of life?" rather than by "What would God have me do with my life?" It is self-will as opposed to God's will. It is the fear of man over the fear of God.
Pride Keeps Us from Choosing the Lord
(D&C 39:7-12) President Benson warns that pride keeps us from choosing the Lord.