These three characters combine in a common Chinese grammatical structure called a “potential complement.” The structure is `Verb + 不 (bù) / 得 (de) + Result`. Here, 听不懂 (tīng bu dǒng) means you “listen” but are unable to achieve the result of “understanding.”
While 听不懂 (tīng bu dǒng) is a simple, direct phrase, its usage touches upon Chinese social dynamics.
This distinction between sensory input (listening vs. reading) is fundamental in Chinese and has no direct single-phrase equivalent in English. Mastering this difference is a major step for a beginner.
听不懂 is a high-frequency, indispensable phrase used daily across China.