Source : Webster's Revised Unabridged Dictionary (1913)

Beautiful \Beau"ti*ful\, a.
   Having the qualities which constitute beauty; pleasing to the
   sight or the mind.

         A circle is more beautiful than a square; a square is
         more beautiful than a parallelogram.     --Lord Kames.

   Syn: Handsome; elegant; lovely; fair; charming; graceful;
        pretty; delightful. See {Fine}. -- {Beau"ti*ful*ly},
        adv. -- {Beau"ti*ful*ness}, n.

Source : WordNet®

beautiful
     adj 1: delighting the senses or exciting intellectual or emotional
            admiration; "a beautiful child"; "beautiful country";
            "a beautiful painting"; "a beautiful theory"; "a
            beautiful party" [ant: {ugly}]
     2: aesthetically pleasing
     3: (of weather) highly enjoyable; "what a beautiful day"