Love-sick a.
  1. Languishing with love or amorous desire; as, a love-sick maid.
     To the dear mistress of my love-sick mind.   --Dryden.
  2. Originating in, or expressive of, languishing love.
     Where nightingales their love-sick ditty sing.   --Dryden.
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  lovesick
       adj : languishing because of love; "strong men behaving like
             lovesick boys"