What is the most difficult accent to understand?

British English might be hard to understand at first (but it's so lovely!)...personally I had a harder time in understanding people from Minnesota! (I'm not a native English speaker).

WE have the same view, I think it European accent.

Philipines, they sound like a robot speaking, some American accents, Glaswegian and Scouse all the best urban

I think that all different accents are hard to understand at first, until you get used to being around it.....When we moved here to Tennessee, from Ohio, I had a hard time understanding people because of the different accent, but now that i am used to it, i do not even hear it anymore.

I once worked at a travel corp where we would get a lot of calls from travel agents with accents. I had the hardest time understanding those with thick Jamacian accents but only if they spoke fast. For the most part if they spoke slowly I didn't have much of an issue understanding them.

I'm European and I think you just made a very generalised statement as not all Europeans have the same accent. Even just within Great Britain there is many different accents. Personally I find that provided a person is speaking a language you understand, and they pronunciate well, no accent is too hard to understand.