韧 ⇒
韧带 rèndài, [韌帶], ligament
坚韧 jiānrèn, [堅韌], tough and durable/tenacious
柔韧 róurèn, [柔韌], pliable and tough/supple and strong/flexible
柔韧性 韧性 rènxìng, [韌性], toughness
韧 rèn, [靭]/[靱]/[韌], variant of 韌|韧[rèn], old variant of 韌|韧[rèn], annealed/pliable but strong/tough/...
坚韧不拔 jiānrènbùbá, [堅韌不拔], firm and indomitable (idiom); tenacious and unyielding
韧劲 rènjìn, [韌勁], tenacity