Which word best describes a slender or slight object?

The word "tenuous" is a fitting description for something that is slender or slight. In various contexts, "tenuous" is often used to convey the idea of fragility or a lack of strength, which aligns with the concept of being thin or delicate. This term can pertain not only to physical objects but also to abstract ideas, suggesting something that lacks substance or solidity. Its applicability to lightweight or slender items makes it the most suitable choice among the options provided.

In contrast, the other terms do not capture the intended meaning effectively. "Transitory" relates to things that are temporary or fleeting, "stern" refers to a serious or strict demeanor, and "superfluous" denotes excess or unnecessary elements. None of these terms conveys the physical characteristics associated with slenderness like "tenuous" does.