unexpandable
Adjective
Meaning
unexpandable (not comparable)
Not expandable.
Examples
TeX is a macro - and token -based language: many commands, including most user-defined ones, are expanded on the fly until only unexpandable tokens remain, which are then executed.
The input for the third stage is then a stream of characters (including ones with special meaning) and unexpandable control sequences (typically assignments and visual commands).