Existentialism

a philosophical theory or attitude having various interpretations generally emphasising the existence of the individual as a unique agent with free will and responsibility for his or her own acts though living in a universe devoid of any certain knowledge of right and wrong from ones plight as a free agent with uncertain guidelines may arise feelings of anguish Existentialism is concerned more with concrete existence rather than abstract theories of essences is contrasted with rationalism and empiricism and is associated with Kierkegaard Heidegger and Sartre as well as others