决非 (jué fēi) — is definitely not, is by no means

Definition

Examples

• 这决非小事，我们必须认真对待。
  Zhè jué fēi xiǎo shì, wǒ men bì xū rèn zhēn duì dài.
  This is by no means a small matter; we must take it seriously.
• 他的成功决非偶然，而是长期努力的结果。
  Tā de chéng gōng jué fēi ǒu rán, ér shì cháng qī nǔ lì de jié guǒ.
  His success is definitely not accidental; it's the result of long-term effort.
• 这种说法决非事实，请不要相信。
  Zhè zhǒng shuō fǎ jué fēi shì shí, qǐng bú yào xiāng xìn.
  This claim is by no means the truth; please don't believe it.