From WordNet (r) 2.0 (August 2003) [wn]:
successful
adj : having succeeded or being marked by a favorable outcome; "a
successful architect"; "a successful business venture"
[ant: unsuccessful]
From The Collaborative International Dictionary of English v.0.48 [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]