The quality of being impossible to measure, understand, or reach the bottom of something.
From 'fathomless' + '-ness' noun suffix (Old English origin). Created in the 1700s to transform the adjective into an abstract noun describing the state of being immeasurable.
This word perfectly captures what terrified ancient explorers about the ocean—not just that it was deep, but that they couldn't even comprehend how deep. The '-ness' suffix transforms a description into a feeling, making 'fathomlessness' the noun version of that awe and confusion.
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