"Monolingual" is the standard term in linguistics. You'll be hard pressed to find anyone using the term "unilingual". (I get that you want to mix Latin with Lat

"Monolingual" is the standard term in linguistics. You'll be hard pressed to find anyone using the term "unilingual". (I get that you want to mix Latin with Latin, but that's not how language works — especially not when it's borrowed into a language. I notice you also pluralize "monoglots" in English rather than Greek...) Furthermore, the distinction in linguistics between "-glot" and "-lingual" is that "-lingual" is used in reference to native language(s) whereas "-glot" is used about the languages a person is able to speak at a given level without them necessarily being native languages. So — to a linguist at least — you can be a monolingual polyglot if you have one native language but e.g. conversational knowledge of 4 other languages.