having no bottom, or so deep that the bottom cannot be seen or reached; seemingly endless or infinite.
From 'bottom' + '-less' (without). Old English 'botm' meant the lowest part or foundation.
The term 'bottomless pit' appears in religious texts for thousands of years, and divers exploring ocean depths discovered actual trenches so deep that light can't penetrate—so 'bottomless' began as metaphor but nearly matches reality!
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