Catching up a bit:

• disingenuous October 10, 2011 (Wordsmith)
• providence, n. October 10, 2011 Oxford English Dictionary
• sustain October 10, 2011 (Merriam-Webster)
• titubant: Dictionary.com Word of the Day October 10, 2011 (Dictionary.com)
• vesuvian: Dictionary.com Word of the Day October 7, 2011 (Dictionary.com)