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From The Collaborative International Dictionary of English v.0.48:
Unwell \Un*well"\, a. 1. Not well; indisposed; not in good health; somewhat ill; ailing. [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 language. [1913 Webster]