from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Requiring much effort or attention: exhausted by a demanding job. See Synonyms at burdensome.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Requiring much endurance, strength, or patience.
- v. Present participle of demand.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. requiring more than usually expected or thought due; especially great patience and effort and skill
From demand + -ing. (Wiktionary)