Hardest language to learn?

Question

What is the hardest language to learn in your opinion? And why?

Answer 1

Haskel... Its very powerfull, but hard-math oriented

Answer 2

i know all these languages. agree, getting very good in haskel and c++ is really hard. the others are not that scarry.

Answer 3

On sololearn? Probably C++ as it is more low level then the others, but then again it depends on what you've done before as well.

Answer 4

Hardest language ever? That thing: https://en.wikipedia.org/wiki/Malbolge
Just horrible (even non Turing-complete) language