2 sentences for 坚韧 (jiān​rèn — tenacious)

1. 艰苦的环境造就了他坚韧不拔的性格。

   jiān​kǔ de huán​jìng zào​jiù le tā jiān​rèn bù bá de xìng​gé.

   The harsh environment forged his resilient character.

   Source: Dong Chinese Dictionary

2. 面对长期的挫折，他展现出了坚韧的意志力。

   miàn​duì cháng​qī de cuò​zhé, tā zhǎn​xiàn chū le jiān​rèn de yì​zhì​lì.

   Facing long-term setbacks, he demonstrated resilient willpower.

   Source: Dong Chinese Dictionary