The Pirahã language has no numbers, no colours, and no past tense

Spoken by a small Amazonian tribe, Pirahã defies almost every universal linguists assumed all languages share. It has no words for specific numbers — only rough equivalents of 'few' and 'many' — no colour terms, and no way to express events that happened before living memory. It has reignited the debate about whether language shapes thought.

Source: MIT Cognitive Science Laboratory / Daniel Everett, 'Don't Sleep, There Are Snakes' (2008)