One who endures; a person who persists through hardship, pain, or difficult circumstances without giving up.
From 'endure' plus '-er' suffix (from Old English '-ere'), forming an agent noun describing someone who performs the action of enduring.
An 'endurer' is subtly different from a 'survivor'—survivors made it out, but endurers are still in it, gritting it out, making them more psychologically resonant figures in literature about suffering and persistence.
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