the GNU version of the Collaborative International Dictionary of English
adj. Not successful; not producing the desired event; not fortunate; meeting with, or resulting in, failure; unlucky; unhappy.
The Century Dictionary and Cyclopedia
Not successful; not producing the desired event; not fortunate.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. failing to accomplish an intended result
adj. not successful; having failed or having an unfavorable outcome
Word Usage
"During the course of the investigation, Blecker forged three additional letters in unsuccessful attempts to have the new RTP cancelled and withdrawn."