Final answer:
The bold adjective 'confident' describes the noun 'Nala' in the sentence, indicating her self-assuredness from adventures.
Step-by-step explanation:
The bold adjective 'confident' is used to describe the noun 'Nala'. In the sentence, 'Confident and strong from her many adventures, Nala finally became a superhero,' 'confident' indicates the self-assured manner of Nala due to her experiences. Adjectives are vital in providing more information about nouns, helping to create a vivid picture in the reader's mind.