The Collaborative International Dictionary of English v.0.48:
Wonderful \Won"der*ful\, a. Adapted to excite wonder or admiration; surprising; strange; astonishing. [1913 Webster] Syn: Marvelous; amazing. See Marvelous. [1913 Webster] -- Won"der*ful*ly, adv. -- Won"der*ful*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
wonderfulness n 1: admirable excellence [syn: admirability, admirableness, wonderfulness]