Which term expresses a characteristic of being bold or strong in music?

The term that expresses a characteristic of being bold or strong in music is "risoluto." This term is often used to convey a sense of determination and assertiveness in the performance of a piece. When a conductor or composer instructs musicians to play "risoluto," it indicates that they should perform with a confident and vigorous character, highlighting powerful emotions and dramatic effects.

In contrast, the other terms provided have different meanings. "Poco" means "a little" and is used to indicate a slight degree of something, which does not relate to boldness. "Presto" refers to a very fast tempo, emphasizing speed rather than strength. "Quasi" translates to "almost" or "like," which modifies a term but does not inherently convey boldness on its own. Thus, "risoluto" is the most appropriate choice for describing a strong and bold musical character.