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Webster 1913 Edition

Adj.

Not well; indisposed; not in good health; somewhat ill; ailing.

(Med.)

Specifically, ill from menstruation; affected with, or having, catamenial; menstruant.

☞ This word was formerly regarded as an Americanism, but is now in common use among all who speak the English language.

Adj.

Not well; indisposed; not in good health. [It expresses less than sick.]

unwell ‎(comparative more unwell, superlative most unwell)

Not well; indisposed; not in good health; somewhat ill; ailing.
(dated, euphemistic) Specifically, ill from menstruation; affected with, or having, catamenial; menstruant.

not well