What term is used to indicate something of great utility or importance?

The term that indicates something of great utility or importance is "invaluable." This word conveys the idea that something has such significant worth or utility that it cannot be measured in terms of value, reflecting its critical role or importance. In various contexts, particularly in law enforcement, recognizing what is invaluable can directly impact decision-making and resource allocation.

Other terms, such as trivial, optional, and unnecessary, denote lack of importance or significance, which contrasts sharply with the meaning of invaluable. Trivial suggests something of little value or importance; optional implies that something is not required; and unnecessary indicates that something is not needed. Therefore, these terms do not align with the concept of great utility or importance, making invaluable the only appropriate choice.