HSK 7-9
不可思议
bùkě-sīyì(idiom) inconceivable; unimaginable; unfathomable
他能记住全部数字真不可思议。
Tā néng jì zhù quán bù shù zì zhēn bù kě sī yì.
It is incredible that he can remember all the numbers.
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Appears across levels (7-9) in the HSK 3.0 word list.