'Unsuccessful' definitions:

Definition of 'unsuccessful'

(from WordNet)
adjective
Not successful; having failed or having an unfavorable outcome [ant: successful]
adjective
Failing to accomplish an intended result; "an abortive revolt"; "a stillborn plot to assassinate the President" [syn: abortive, stillborn, unsuccessful]

Definition of 'Unsuccessful'

From: GCIDE
  • Unsuccessful \Un`suc*cess"ful\, a. Not successful; not producing the desired event; not fortunate; meeting with, or resulting in, failure; unlucky; unhappy. -- {Un`suc*cess"ful*ly}, adv. -- {Un`suc*cess"ful*ness}, n. [1913 Webster]