Forth is actually disengaged from mainstream languages; Lisp being disengaged from mainstream languages is just a meme believed by some non-Lisp programmers (something to do with those parentheses). Basic Lisp is very similar to mainstream languages in the Algol family. Lisp dialects usually have nested block structure, with local variables that can be assigned, functions with formal parameters with ordinary by-value argument passing and so on. Javascript is a mainstream language and has strong ties to Lisp, much more so than to Forth. Python is more closely related to Lisp than to Forth. C is more closely related to Lisp than to Forth. Java is more closely related to Lisp than to Forth ....