An irrational fear of infinity or of things that are boundless or endless.
From Greek 'apeiron' (boundless, infinite) + 'phobos' (fear). This psychological term combines the ancient philosophical concept with the modern suffix for phobias, creating a term for a very specific existential anxiety.
Apeirophobia captures a deep human anxiety—the fear of endlessness and infinity—which explains why some people get uncomfortable thinking about space, eternal time, or endless possibilities; it's the opposite of claustrophobia, and quite rare.
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