The word "坚韧" is formed by combining two characters: "坚", meaning firm or hard, and "韧", meaning tough or pliable. "坚" is structured with the radical "土" (earth) and the phonetic component "臤", which reinforces the sense of solidity. "韧" is composed of the radical "韦" (leather) and the phonetic "刃", emphasizing flexibility and durability. Together, these characters create a compound word that denotes the quality of being both strong and resilient.