Lua. It might be because it was the first language I ever learned. But even now, having more experience with an array of languages, I still see a steep learning curve.
Specifically I learned to use it with Löve2d
It is extraordinarily not-strict. No guidelines, no rules, you basically make your own framework every time you make a program.
If you are not familiar with the basic workings of other languages, certain coding conventions, or OOP, the looseness of Lua can lead you to make some terrifying spaghetti monsters.
But, looking back at it now, I can definitely appreciate the freedom it gives you, and how it forced me to learn certain things that I may have not learned in another language.
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