What are synonyms of the word trilingual?

Here are some synonyms for "trilingual", keeping in mind that some are more formal than others:

Formal:

* Polyglot (specifically referring to three languages)

* Three-language proficient

* Fluent in three languages

Informal:

* Speaks three languages

* Knows three languages

* Tri-lingual (This is a more informal variation of the word)

The best synonym to use will depend on the context of your writing.