Manmukh literally means "to follow one's mind or desires".
The word Manmukh consists of two parts: Man and Mukh. Man means "one's own mind or one's own desires" and Mukh literally means "face", so the full word conveys the message "One who follows whichever way his or her mind leads or goes"; "one who follows his or her desires"; "one who does as his or her mind dictates". The Manmukh is attached to worldly desires, material wealth, worldly allurements and sensual enjoyments. His desires and his needs are unlimited.
To be a Manmukh is to follow one's own mind or desires without regards for anyone else. A person who is self-centred is called a Manmukh. The opposite of Manmukh is Gurmukh, which means a person who follows the teaching and life-code as narrated by the guru. A Manmukh is the opposite of a Gurmukh. Hence, a Manmukh is a material being (egoistic or attached to worldly things) as opposed to a spiritual being. The people with materialistic attachment believe that everlasting happiness is attainable only in acquisition (i.e. ownership) and the use of these material objects. In other words, a Manmukh is ruled by and is conditioned by pleasure of his five senses and his mind. Simply stated, a Manmukh is an ego-centric person whose actions are controlled by the following urges and desires: lust, anger, greed, material attachment, self-conceit, envy and stubborn mindedness, with their numerous variations.
As a result, he has no belief no understanding of the Naam (God's existence), Shabad (word of the guru), Hukam (will of the Almighty), Atma (Soul), or God (Spirit or Sat Guru). Consequently, he has no understanding of the ultimate purpose of life, his relationship with God, and the way of God (Gurmat). In this madness and illusion and "I-am-ness", he cultivates the life of a faithless cynic called "Saakat" — an unwise and an untrue being. Thus, according to the Gurbani, anyone who has not realized the Self within (God, Truth, Shabad or Naam, etc.) alone is a Manmukh.
Everyone in the world can be categorised as either a servant of Maya or a servant of the Akal. Those who serve Maya are called Manmukhs, and those who serve the Truth (God) are called Gurmukhs or Divine. Thus, a Manmukh regardless of how advanced he may be in his or her material qualifications by education or cultural status, lacks in Divine qualities; consequently, is not aware of the Cosmic Reality that is contained within him/her. Such individuals fail to attain Spiritual Perfection or Intuitive Understanding of the "ultimate reality"; for their intellect is dimmed by material contamination. They hate holiness. They chase after Maya, and wander in this dense forest of material existence like a beast in human garb.