不必

• Pinyin: bù bì
• Hanzi breakdown: 不 = pictograph of a bird flying up and being blocked, meaning not; 必 = 心 (heart) + a stroke through it, meaning certainly/must

Meaning

Need not; not necessary. A polite way of saying something does not need to be done.

More formal than 不用 but carries the same meaning. Often used to reassure someone or to politely decline help. Common in both spoken and written Chinese, especially in slightly formal situations.

Examples

1. 你不必担心，一切都会好的。 You don't need to worry, everything will be fine.
2. 这件事不必太着急，慢慢来。 There's no need to rush this matter, take your time.
3. 不必客气，这是我应该做的。 No need to be polite, this is what I should do.

Usage Guide

Context: polite speech, reassurance, everyday

Tone: reassuring

Do Say

• 你不必特意来接我。(You don't need to come pick me up specially.)
• 不必紧张，考试不难。(No need to be nervous, the exam isn't hard.)

Don't Say

• 我不必吃饭了 as a casual refusal (In casual contexts, 不用 sounds more natural than 不必, which can feel overly stiff among friends)

Origin & History

Compound of 不 (not) and 必 (must, certainly), literally 'not necessarily must.'

Cultural Context

Generation: All ages

Social background: Universal