This term denotes what cannot be exhausted or used up. Jesus uses it in Luke 12:33 to describe treasure in heaven that never fails or runs out. Classical writers used it for uninterrupted processes and infinite divisions. The Septuagint employs it for unfailing divine provision. English 'unfailing,' Spanish 'inagotable' (inexhaustible), and French 'inépuisable' all emphasize the inexhaustible nature. The German preserves the Greek form, perhaps indicating the translator's sense that no single German word captures the full meaning.