It describes something so extraordinary or unbelievable that it's hard to accept as true.
不容易相信。
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When she said she had climbed Mount Everest without training, I found it难以置信.
Learn the next connected idiom: 难以置信 (nán yǐ zhì xìn) → 信以为真 (xìn yǐ wéi zhēn)
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