HSK 7-9
不定
búdìng形副
indefinite; indeterminate; (botany) adventitious
会议日期暂时还不定。
Huì yì rì qī zàn shí hái bú dìng.
The date of the meeting remains undecided.
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Appears across levels (7-9) in the HSK 3.0 word list.