‘都不’ is an adverbial phrase meaning 'none' or 'not any', used to express complete negation across all members of a group or all instances of an action. It combines 都 (dōu), which emphasizes totality ('all', 'every'), and 不 (bù), the standard negator ('not'). Together, they strengthen the negative scope—indicating that not a single item or person in the referenced set satisfies the condition. This phrase typically appears before a verb or adjective and often follows a subject that implies plurality (e.g., pronouns like 他们, 我们, or plural nouns).

It’s commonly used in spoken and written Chinese to convey disappointment, surprise, or factual absence—such as when no one attended an event, no option works, or nothing was completed. Unlike the simple negator 不 alone, 都不 adds emphasis and universality: it rules out exceptions entirely. It cannot be used with positive verbs; the predicate must be negative in meaning, even if grammatically unmarked (e.g., in some constructions with 没). Its tone is neutral but carries pragmatic weight.