Everything is hard when you first learn it. If you find it easy, that's only because you don't have to learn part of it because you learned the concept in a different language. Even learning to count was hard when we were small children.
A better measure IMO is how long it might take you specifically. For example, Rust is much easier for me to learn than Haskell because I have never coded in a functional language before. Golang was very easy to pick up on. I never took time to learn python and powershell, I just kept referencing existing code and googling for examples because they were both mostly familiar languages with a different syntax.