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深信不疑
shēnxìnbùyí
1. to believe firmly without any doubt (idiom)
2. absolute certainty about sth

Character Breakdown

深
shēn
deep, profound; depth
HSK 4 11 丶
信
xìn
to trust, to believe; letter, sign
HSK 3 9 丶
不
bù
no, not, un-; negative prefix
HSK 1 4 丶
疑
yí
to doubt, to question, to suspect
HSK 4 14 丶

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