I'd think that it was difficult. Icelandic--one of the world's most unchanged languages--is believed to be one of the hardest. Maybe Basque as well. Aside from some African languages that use clicks and such.
A white South African colleague of mine speaks two clicks language; Zulu and Xhosa. It's fascinating to hear him speak them and I've probably asked so many questions about it that he hates me.
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