nihilism

The philosophical belief that life is without objective meaning, purpose, or intrinsic value; the rejection of all religious and moral principles.

• nihilist/ˈnaɪɪlɪst/(n)虚无主义者
• nihilistic/ˌnaɪɪˈlɪstɪk/(adj)虚无主义的

• moral nihilism
• existential nihilism
• descend into nihilism
• nihilism of the modern age

1. 1.Nietzsche warned that the death of God would lead to nihilism — a world without shared moral foundations. (rejection of meaning)
2. 2.The character's nihilism isn't cool detachment; it's the depression of someone who has stopped believing anything matters. (meaninglessness)

• cynicism/ˈsɪnɪsɪzəm/— distrust of human motives — weaker
• fatalism/ˈfeɪtəlɪzəm/— belief that events are predetermined — different focus
• existential despair (emotional, not philosophical)

from Latin "nihil" (nothing) + "-ism" — the philosophy of nothing