American Heritage Dictionary
(1)
Century Dictionary
(2)
GNU Webster's 1913
(2)
WordNet
(2)
Elsewhere on the web
Even more imponderable are questions about Palin's future priorities.— Merced Sun-Star: front
The real imponderable, though, is whether the US, in the crunch, would rush to defend the South with all the arms it needed, as well as an infusion of troops, if North Korea were to take advantage of America's relationship with Israel and the Middle East to stage a surprise attack.— Asia Times Online
Another imponderable is the financial health of George Gillett's portfolio.— Soccer Blogs - latest posts

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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