说不定 (shuō bu dìng)
can't say for sure; maybe
Character breakdown
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说 (shuì) · 9 strokes
Phonosemantic compound. 讠 represents the meaning and 兑 represents the sound.
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不 (bù) · 4 strokes
Pictograph of sepals of a flower. The modern meaning "no" is a phonetic loan.
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定 (dìng) · 8 strokes
Phonosemantic compound. 宀 represents the meaning and 正 represents the sound.