I didn't mention lisps because I'm never sure how to classify "built-in" special forms: should they be considered normal names and thus omitted from a syntactic overview or should they be considered keywords and included?

On the one hand they usually have non-normal evaluation and custom mini-languages, on the other so do most macros otherwise you'd just use a function.

But yeah, these are the sort of languages I think of as "simple": small languages which reach "smallness" by giving access to a limited set of extremely powerful constructs.