A philosopher or person who believes that certain kinds of things (like abstract objects or moral truths) don't exist independently of human thought.
From antirealism + -ist (one who practices or believes in). Emerged as philosophical terminology in late 20th-century academic discourse.
An antirealist about ghosts thinks they don't exist even when nobody's watching—unlike realists who say ghostly reality is independent of observers—a debate that haunts philosophy.
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