深信

• Pinyin: shēn xìn
• Hanzi breakdown: 深 = 氵component (deep); 信 = 亻+ 言 (person speaking truthfully — trust, belief)

Meaning

To firmly believe; to be deeply convinced; to have full and unshakeable confidence in something.

Expresses a higher degree of belief or conviction than 相信 alone. Often followed by 不疑 to form 深信不疑 (to be completely convinced without any doubt). Used in formal, philosophical, and personal conviction contexts to convey certainty and commitment.

Examples

1. 他深信只要坚持不懈地努力，终有一天能够实现自己的目标。 He firmly believes that as long as he keeps working hard, he will achieve his goals one day.
2. 科学家们深信这项新技术将彻底改变现有的能源格局。 Scientists are deeply convinced that this new technology will completely transform the current energy landscape.
3. 她深信不疑地接受了那个人的说法，没想到最终却被欺骗了。 She believed that person’s story without a doubt, but in the end she was deceived.

Usage Guide

Context: conviction, science, philosophy, personal belief

Tone: serious

Do Say

• 团队深信这次合作将为双方带来持久的互利共赢局面。(The team is deeply convinced that this collaboration will bring about a lasting mutually beneficial outcome for both sides.)
• 我深信公正终将战胜偏见，历史会对这段岁月做出公正的评判。(I firmly believe that justice will ultimately prevail over prejudice, and history will render a fair judgement on this period.)

Don't Say

• 深信 for casual opinions — 深信 implies firm, unshakeable conviction; for everyday opinions use 觉得 or 认为 instead

Origin & History

深 (deeply, profoundly) + 信 (to believe, to trust)

Cultural Context

Generation: All ages

Social background: Universal