Which characteristic best describes oily hair?

Oily hair is best described as appearing greasy and lacking volume. This characteristic arises from the overproduction of sebum by the sebaceous glands located on the scalp. When excess oil builds up, it can weigh the hair down, making it appear limp and lifeless. The greasy appearance is often accompanied by a slick texture, contributing to the overall perception of oiliness.

In contrast, other descriptions do not align with the traits of oily hair. Hair that appears dry and brittle would suggest a lack of moisture and oil, which is the opposite of what oily hair presents. A smooth and shiny texture can sometimes be associated with oily hair, but it also depends on how oily the hair is and whether it appears greasy. Being easy to style and manage is not typical of oily hair, as the weight from excess oil can complicate styling and often leads to a need for more frequent washing to maintain a clean and voluminous look.