"Nǎo rén" literally combines 恼 (nǎo), meaning 'to annoy' or 'to vex', and 人 (rén), meaning 'person'. Together, it functions as an adjective describing something that causes irritation or frustration — not a person who is annoyed, but rather something that *annoys people*. It’s commonly used to describe situations, behaviors, sounds, or objects that are persistently bothersome, such as loud noises, slow internet, or repetitive questions.

This word carries a mild-to-moderate degree of annoyance — stronger than 'a little annoying' but weaker than 'enraging'. It’s neutral in register and widely used in both spoken and written Chinese. Unlike some emotion-related adjectives, 恼人 doesn’t require the particle 得 (de) to form complements; it can directly modify nouns (e.g., 恼人的噪音) or serve as a predicate (e.g., 这真恼人). It reflects a shared, relatable experience rather than intense personal anger.