from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Tending to undervalue oneself and one's abilities.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. expressing disapproval or being critical of oneself.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. conscious of your own shortcomings
self- + deprecating, present participle of to deprecate (Wiktionary)