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The name comes from a colloquial phrase of understatement. For an egg, being hard-boiled is comparatively tough. It's not really very tough at all, but it amused people to refer to a tough guy as "hard-boiled". The other kind of detective, the "armchair detective" or someone who figures out crimes committed by proper ladies and gentlemen in "English country gardens" and who never has to worry about violence, systematic official deceit, having to tell lies to the police in return, or personal contact with the sordid side of crime, would be considered soft.