An irrational fear of marriage or of entering into a marriage commitment.
From Greek 'gamete' (wife) and 'phobos' (fear); the term emerged in early 20th-century psychology to describe a specific anxiety disorder related to matrimonial commitment.
This word reveals how psychologists once tried to name every possible fear—gametophobia sits alongside hundreds of other -phobia terms, though it never became common because people usually just say 'commitment issues' today.
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