The term "artificial language" refers to a language which is created by humans, and usually lacks the complexity and nuances of natural languages. Antonyms for "artificial language" could include "natural language", which refers to any language that evolved naturally among people, rather than being constructed for a specific purpose. Other antonyms might include "complex language", "nuanced language", "living language", or "organic language", all of which convey the idea that a natural language is highly evolved, nuanced, and adaptable to the needs of its speakers. Some other antonyms might include "simple language", "primitive language", or "basic language", which could be used to contrast a highly evolved natural language with a rudimentary or artificial one.