Definition: nontubular is a term used in the field of linguistics and psychology to describe individuals who have no known or learned language, meaning they cannot speak, write, read, or understand any form of written text. These individuals may also lack the ability to generate speech sounds and produce coherent sentences. Nontubulars are often found in isolated populations or communities with limited access to cultural resources that would normally support their linguistic development. Nontubulars can be categorized into two main types