不定 búdìng indefinite
indefinite; indeterminate; (botany) adventitious
How to remember 不定: 不 not + 定 decide = indefinite.
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How it is used
- 'Uncertain, unsettled' - 心神不定 (xīnshén búdìng) restless and unsettled.
- Very often bound in 说不定 (shuōbudìng, maybe) - 说不定明天会下雨 (shuōbudìng míngtiān huì xià yǔ) maybe it'll rain tomorrow.