What does the adjective "sleek" typically refer to?

The adjective "sleek" typically refers to something that is shiny and smooth. This term is often used to describe objects, surfaces, or even appearances that exhibit a polished and well-groomed look. For example, a sleek car might have a shiny exterior with aerodynamic lines, giving it a sophisticated and modern appearance. This quality of being smooth and shiny conveys an impression of elegance and finesse, which is why "sleek" is frequently associated with aesthetics in fashion, design, and even animal coats.

In contrast, other options suggest characteristics that do not align with the definition of "sleek." Rough and unkempt describe something that lacks polish or neatness, while dull and boring imply a lack of interest or excitement, both of which oppose the vibrant connotation of "sleek." Solid and heavy indicates weight and density, which do not pertain to the smoothness or shine that define the term.