说不定

• Pinyin: shuō bu dìng
• Hanzi breakdown: 说 = 讠(speech radical) + 兑 (exchange, phonetic), to say; 不 = negation particle; 定 = 宀 (roof) + 正 (upright), settled or certain

Meaning

Hard to say; cannot be determined (V); maybe; perhaps; possibly (Adv). Expresses uncertainty about an outcome, often with a hint of mild surprise at the possibility.

Most commonly used as an adverb at the start of a clause to introduce a possibility the speaker cannot confirm. Equivalent to 也许 or 可能 but more colloquial. Often implies a slightly unexpected possibility. Typically followed by a sentence or clause, and rarely used alone in formal writing.

Examples

1. 说不定他明天就回来了，别太担心。 Maybe he will be back tomorrow — don't worry too much.
2. 她说不定已经知道这件事了，只是没说出来。 She may already know about this but just hasn't said anything.
3. 这个方法说不定真的有效，值得试一试。 This method might actually work — it's worth giving it a try.

Usage Guide

Context: everyday, speech, conversation

Tone: speculative

Do Say

• 说不定她就是那个新来的老师呢。(Maybe she is the newly arrived teacher — who knows.)
• 天气变化太快，说不定明天就晴了。(The weather changes so fast — maybe it will clear up by tomorrow.)

Don't Say

• 在正式书面语中用'说不定'代替'可能' (Avoid using 说不定 in formal written Chinese — use 可能 or 也许 instead, as 说不定 is conversational)

Origin & History

A compound predicate made of 说 (to say) + 不定 (not certain/unstable), literally 'cannot say for certain'. Over time it grammaticalised into a colloquial adverb of probability.

Cultural Context

Generation: All ages

Social background: Universal