黑暗 literally combines 黑 (hēi, 'black') and 暗 (àn, 'dim' or 'dark'), together forming a noun meaning 'darkness'—the physical absence of light. It is commonly used in both concrete and abstract contexts: describing nighttime, shadowy places, or unlit rooms, as well as metaphorical situations like political oppression, ignorance, or emotional despair.

The word carries strong connotations beyond mere low light—it often implies danger, mystery, hopelessness, or moral corruption. Unlike the neutral term 黑色 (hēi sè, 'black color'), 黑暗 suggests an enveloping, often threatening quality. It appears frequently in literature, news reports, and everyday speech when discussing social injustice, psychological struggles, or historical periods marked by repression. While it can be modified by adjectives like 深沉的 (shēn chén de, 'profound') or 彻底的 (chè dǐ de, 'complete'), it is rarely used attributively without 的.