Agglutination is used very heavily in most Native American languages, such as the Inuit languages, Nahuatl, Mapudungun, Quechua, Tz'utujil, Kaqchikel, Cha'palaachi and K'iche, where one word can contain enough morphemes to convey the meaning of what would be a complex sentence in other languages. Conversely, Navajo contains affixes for some uses, but overlays them in such unpredictable and inseparable ways that it is often referred to as a fusional language.[citation needed]