深信不疑 (shēn xìn bù yí) — to believe firmly without any doubt; to be completely convinced

Definition

An idiom meaning 'to believe firmly without a shadow of doubt' — stronger than simply 相信, emphasizing total, unwavering conviction.

idiom
to believe firmly without any doubtto be completely convinced

Examples

  • ,深信不疑。
    Tīng le tā de jiě shì, wǒ duì tā de néng lì shēn xìn bù yí.
    After hearing his explanation, I firmly believed in his ability.
  • 深信不疑。
    Tā yì zhí duì kē xué de jìn bù shēn xìn bù yí.
    She has always had unwavering faith in the progress of science.
  • 深信不疑。
    Wǒ men duì zhè ge jì huà de chéng gōng shēn xìn bù yí.
    We are completely convinced of the success of this plan.

Origin

Characters in this word

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

Meaning part形符xíngfú
氵Written in full as水shuǐwater
Sound part声符shēngfú
𥥍
𥥍𥥍深shēn
The sound has drifted apartThe sound part was a clue two thousand years ago — it often still helps, but not always.

深 is built from 氵, the side form of 水 “water”, and 𥥍, which supplies the sound.

Open 深 →

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

Meaning part形符xíngfú
言言yánwords
Sound part声符shēngfú
人
人rén信xìn
The sound has drifted apartThe sound part was a clue two thousand years ago — it often still helps, but not always.

信 pairs 人 as the sound part with 言 (words) as the meaning part.

Open 信 →

A drawing of the thing itself, worn down over three thousand years into a few strokes.

The picture in 不 originally showed a flower’s calyx; the “no” sense came later from a related character, not from this picture.

Open 不 →

Two or more meaningful parts placed together so that their meanings combine into a new one.

  • 大大dàstanding human figure
  • 夂夂zhǐtilted head with open mouth
  • 丨丨gǔncane

疑 depicts a standing figure 大 with a tilted, open-mouthed head 夂 and a cane 丨, a confused person looking around for direction.

Open 疑 →

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