Forth it's easy, but Lisp the core implementation can be easy, yes, but you need to implement Lisp in Lisp, similar to Forth under itself.

Heck, I tested for...next from Eforth under PFE Forth with Forth words, not C. Forth may be the only good case for an easy syntax.

I mean, the Lisp syntax it's dumb easy too but you need to develop the rest of features. Is not just about lists, car and cdr. Altough if you get eval/apply the rest writes itself, such as map and proc.