* Resourceful: Clark was renowned for his adaptability, problem-solving skills, and ability to make the most of limited resources during the Lewis and Clark Expedition.
* Determined: He possessed an unwavering commitment to completing the expedition's goals, facing challenges with resilience and a steadfast focus.
Other adjectives you could consider:
* Courageous
* Skilled
* Tenacious
* Disciplined
* Observant
* Charismatic