What does the term "frizz" refer to in hair?

The term "frizz" refers to unruly, dry hair strands that stick out, creating a rough texture. This condition is typically caused by a lack of moisture in the hair, which occurs when the hair cuticle is raised. When the hair is frizzy, it often appears puffy and lacks the sleekness associated with well-managed hair. Conditions such as humidity can exacerbate frizz by causing the hair to absorb moisture from the air, further disrupting the cuticle and enhancing the rough texture.

The other choices describe different hair characteristics that do not align with the definition of frizz. For instance, perfectly smooth and shiny hair indicates healthy, well-moisturized strands with a closed cuticle, which contrasts sharply with the definition of frizz. A soft, wavy texture describes hair that has defined waves, which can be considered beautiful but does not showcase the disorder seen in frizzy hair. Lastly, hair that is completely straight and fine lacks the rough and unruly nature that characterizes frizz, making it another distinct characteristic.