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Jyutping gin1 ngan6 bat1 bat6
Pinyin jiān rèn bù bá

Definitions (CC-CEDICT)
  1. firm and indomitable (idiom); tenacious and unyielding
Definitions (Wiktionary)
  1. phrase, idiomatic
    firm and indomitable; persistent and dauntless; persevere in tenacious efforts
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    学好一门外语需要坚韧不拔的毅力。
    學好一門外語需要堅韌不拔的毅力。
    xué hǎo yī mén wài yǔ xū yào jiān rèn bù bá de yì lì 。
    • Mastering a foreign language involves a lot of patience.