Acedia = apathy or boredom
This will be a pretty biased entry, but that's what blogs are for.
The French and the Americans accuse each other of acedia regarding different things.

The French often are disgusted by Americans' acedia about foreign affairs. We have a reputation of pushing our military weight around when it suits us and ignoring countries that desperately need our help. I was in France in 2003 and I had to explain to many, many people that, no, I didn't think the U.S. should have invaded Iraq, that yes, I did think our president was a pushy moron, and that yah, it probably would have been better to spend all of that military money stopping the tribal genocide in Africa and feeding starving children. I tried my best to show that not all Americans were apathetic about the rest of the world, but my French acquaintances still used me as a focal point for their frustrations toward the West. Their argument was that if Americans could get off their couch-potato bottoms, shed some of their acedia, and challenge the president, then maybe we could enact change. I didn't have an answer for them there.

So how do Americans accuse the French of acedia with all of their strikes, rallies, social unrest, and heated debates? Religion. When I started to look for a church to attend in Pau in 2003, I was surprised at how far I had to walk from my host home to find a protestant church. In NW Arkansas, there's just about one on every corner. I was also surprised at the selection. My options as a Christian were to attend the Catholic church or the one Protestant church. Baptist? Methodist? Pentacostal? According to Pau, France, they are all just Protestant. Once I got inside, I was surprised again to find that the one Protestant church in town was not even full on Sunday mornings, and they only had one service! What, I wondered, could have driven this country, with all of its beautiful cathedrals, hundreds of relics, and a strong history of evangelism, what could have driven them away from their religious heritage? The more I studied history, the more I learned about the religious wars where people murdered one another for minor doctrinal differences, about the Crusades where "Christian knights" killed people in their own countries if they didn't convert, and then about "la laïcité" which forbids public school students to show outward signs of their religion, and in effect, even forbids them to talk or write about their religion in school. In trying to solve one problem, the French went to the other extreme.
This page gives more (also biased) specifics: "(A) poll indicated that only 10 percent of the French population attends church regularly and of the 51 percent who call themselves Catholics, only half said they believed in God. Those that don’t believe in God said they called themselves Catholic because it was a family tradition."
We all have acedia about something. When is it good? When is it bad? I welcome your comments.