The quality or state of having no end; infinity, eternality, or the feeling of something going on forever.
From Old English 'endeleas' (without end) plus the suffix '-ness' creating an abstract noun. The concept evolved from literal 'without end' to metaphorical uses for duration or quantity.
Philosophers and poets love 'endlessness' because it captures something our brains can't actually process—infinity—yet the word makes it feel almost like something you can touch or experience.
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