It's rather semantic, but I would differentiate typed from untyped by type checking vs. type being an inherent property of a variable.

So you have something in Scheme like:

     (define foo 1)
     (define bar "1")

And that is typed, the former being a number, the latter a string. If you try to subsequently do:

     (+ foo bar)

the program will error out.

Contrast this with what I would consider an untyped language like Python or Perl, where the translation from string to number is done without any warnings showing up.