1. the quality or state of being impossible to measure, understand, or comprehend fully
Usage: abstract noun; often used in literary or philosophical contexts
2. the quality of being extremely deep or bottomless
Usage: literal or figurative use; less common than the abstract sense

Examples

• The fathomlessness of the ocean has captivated explorers for centuries.
• She stared into the fathomlessness of his eyes, unable to read his true emotions.
• The fathomlessness of human consciousness remains one of science's greatest puzzles.
• Ancient philosophers were struck by the fathomlessness of existence itself.
• The fathomlessness of grief made it difficult for him to move forward.
• The universe's fathomlessness inspires both wonder and humility in astronomers.