Erlang was the first functional language I learned. It took me a couple weeks of pain but then once I got it, I started to love it. The "unreadable" becomes poetry. (And truthfully, the support for concurrency in erlang is why I chose it in the first place, I didn't care that it was functional, and since then I've not heard any suggestions of other languages that would make me want to switch, with one exception: elixir)
You might consider, if the syntax is just too painful, looking at elixir. Elixir is effectively erlang but with a more ruby-like syntax. I think elixir exists for other reasons, but the syntax being more readily accessible to ruby developers is a nice side effect.
Not sure if elixir is the best way to learn functional programming, as I knew elrang before learning it, but it is a nice language, it is not a "hipster" language, and it has great support especially given how relatively new it is.