From The Collaborative International Dictionary of English v.0.48:

Unwell \Un*well"\, a.
   1. Not well; indisposed; not in good health; somewhat ill;
      [1913 Webster]

   2. (Med.) Specifically, ill from menstruation; affected with,
      or having, catamenial; menstruant.
      [1913 Webster]

   Note: This word was formerly regarded as an Americanism, but
         is now in common use among all who speak the English
         [1913 Webster]
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