One of the mysteries of the English language finally explained.
1Having no ball or balls.
2US slang, rare Slang (chiefly US). Of a male: having no testicles (rare); (chiefly in extended use) unmanly; weak, lacking in nerve.
Mid 19th century; earliest use found in William Thom (?1798–1848), poet and weaver. From ball + -less.
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