Superficial : not thorough, deep, or complete; cursory.Profound : (of a state, quality, or emotion) very great or intense.Difficult : needing much effort or skill to accomplish, deal with, or understand.Secretive : (of a person or an organization) inclined to conceal feelings and intentions or not to disclose information.Mystical : relating to mystics or religious mysticism.Antonym of Superficial is Profound