Definition
深信不疑 is a four-character idiom (成语) meaning 'to believe something so deeply that no doubt remains'. It emphasizes a strong, unwavering conviction — often used after hearing a convincing explanation or based on long-term trust. You can use it with or without an object: 对…深信不疑 ('have absolute faith in…').
f.e.
to believe firmly without any doubtto be completely convinced
Examples
- ，深信不疑。Tīng le tā de jiěshì, wǒ duì tā de nénglì shēn xìn bù yí.After hearing his explanation, I firmly believed in his ability.
- 深信不疑。Tā yìzhí duì kēxué de jìnbù shēn xìn bù yí.She has always had unwavering faith in the progress of science.
- 深信不疑。Wǒmen duì zhège jìhuà de chénggōng shēn xìn bù yí.We are completely convinced of the success of this plan.
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