Source : Webster's Revised Unabridged Dictionary (1913)

Love-sick \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.