He has a tenacious character — he never gives up easily.
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Think 'flexible-tough': a thin bamboo whip that bends without breaking is 韧. Common compounds: 坚韧 (jiānrèn, 'tough and resilient'), 韧性 (rènxìng, 'toughness, tenacity'), 韧带 (rèndài, 'ligament'), 韧劲 (rènjìn, 'staying power').
