from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of considerable length, especially in time; extended: a lengthy convalescence.
- adj. Tediously long; drawn-out: a lengthy explanation.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. long and overextended, especially in time rather than dimension
from the GNU version of the Collaborative International Dictionary of English
- adj. Having length; rather long or too long; prolix; not brief; -- said chiefly of discourses, writings, and the like.
from The Century Dictionary and Cyclopedia
- Having length; long; especially, of great length; immoderately long, sometimes with the idea of tediousness attached: applied chiefly to discourses, writings, arguments, proceedings, etc.: as, a lengthy sermon; a lengthy dissertation.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. relatively long in duration; tediously protracted
length + -y (Wiktionary)