Both of these list "meaningful" as a synonym of "expressive": https://www.merriam-webster.com/thesaurus/expressive https://www.merriam-webster.com/thesaurus/ex

Both of these list "meaningful" as a synonym of "expressive": https://www.merriam-webster.com/thesaurus/expressive https://www.merriam-webster.com/thesaurus/expressive https://www.thesaurus.com/browse/expressive https://www.thesaurus.com/browse/expressive Of course, "meaningful" can be used in other ways; words often have more than one meaning. On the other hand, the commenter used "meaningful" and "expressive" in parallel, which suggests they already understood them to be distinct. So it's not clear what you're objecting to.