colorful language
he has a colorful language
3 Answers
Tiene un lenguaje muy expresivo
Tiene un lenguaje muy variado.
You maybe could change lenguaje for vocabulario.
colorful language sometimes has the connotation of full of "off-color" (risqué) remarks or swear words (palabrotas). In that context, atrevido might be used.
he has a colorful language