Nie·tzsche (nē'chə, -chē) German philosopher who reasoned that Christianity's emphasis on the afterlife makes its believers less able to cope with earthly life. He argued that the ideal human, the Übermensch, would be able to channel passions creatively instead of suppressing them. His written works include Beyond Good and Evil (1886) and Thus Spake Zarathustra (1883-1892). Nie'tzsche·an adj. & n.