Source : Webster's Revised Unabridged Dictionary (1913)

Cleverness \Clev"er*ness\, n.
   The quality of being clever; skill; dexterity; adroitness.

   Syn: See {Ingenuity}.

Source : WordNet®

cleverness
     n 1: the power of creative imagination [syn: {inventiveness}, {ingeniousness},
           {ingenuity}]
     2: intelligence as manifested in being quick and witty [syn: {brightness},
         {smartness}]
     3: the property of being ingenious; "a plot of great
        ingenuity"; "the cleverness of its design" [syn: {ingenuity},
         {ingeniousness}]