from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Not producing an intended effect; ineffectual: an ineffective plea.
- adj. Inadequate; incompetent: an ineffective teacher.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. not having the desired effect; ineffectual
- adj. lacking in ability; incompetent or inadequate
from the GNU version of the Collaborative International Dictionary of English
- adj. Not effective; not having the desired effect; ineffectual; futile; inefficient; useless.
from The Century Dictionary and Cyclopedia
- Not effective; not producing any effect, or the effect desired; wanting effective energy or operation; inefficient; impotent: as, ineffective efforts; an ineffective blow.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. not producing an intended effect
- adj. lacking in power or forcefulness
- adj. lacking the ability or skill to perform effectively; inadequate
in- + effective (Wiktionary)