1. the quality or state of being bottomless; having no bottom or no visible bottom
Usage: often used literally to describe physical spaces or figuratively to describe abstract concepts
2. the quality of being seemingly endless or inexhaustible
Usage: figurative use

Examples

• The bottomlessness of the ocean has fascinated explorers for centuries.
• She stared into the bottomlessness of the dark cave with growing unease.
• The bottomlessness of his greed made him impossible to satisfy.
• The well seemed to have a quality of bottomlessness that defied measurement.
• The bottomlessness of space inspires wonder in astronomers and philosophers alike.
• His appetite for knowledge had an almost bottomlessness to it.