The Collaborative International Dictionary of English v.0.48:

Smartness \Smart"ness\, n.
   The quality or state of being smart.
   [1913 Webster]

WordNet (r) 3.0 (2006):

smartness
    n 1: a kind of pain such as that caused by a wound or a burn or
         a sore [syn: smart, smarting, smartness]
    2: intelligence as manifested in being quick and witty [syn:
       brightness, cleverness, smartness]
    3: elegance by virtue of being fashionable [syn: chic,
       chicness, chichi, modishness, smartness,
       stylishness, swank, last word]
    4: liveliness and eagerness; "he accepted with alacrity"; "the
       smartness of the pace soon exhausted him" [syn: alacrity,
       briskness, smartness]