'Successfulness' definitions:

Definition of 'successfulness'

From: WordNet
noun
The condition of prospering; having good fortune [syn: prosperity, successfulness]

Definition of 'Successfulness'

From: GCIDE
  • Successful \Suc*cess"ful\, a. Resulting in success; assuring, or promotive of, success; accomplishing what was proposed; having the desired effect; hence, prosperous; fortunate; happy; as, a successful use of medicine; a successful experiment; a successful enterprise. [1913 Webster]
  • Welcome, nephews, from successful wars. --Shak. [1913 Webster]
  • Syn: Happy; prosperous; fortunate; auspicious; lucky. See Fortunate. [1913 Webster] -- {Suc*cess"ful*ly}, adv. -- {Suc*cess"ful*ness}, n. [1913 Webster]