Frizzy hair is hair that curls very tightly, often in small, springy pieces that stand out instead of lying smooth. People say hair is frizzy when wet air makes it puff up, or when the natural curl is tight rather than soft. It is an everyday adjective, very common in talk about hair. You describe the hair, not the person: frizzy hair is the usual pattern. Though actually, not all curly hair is frizzy — large, neat curls are just curly; frizzy is the tight, flyaway kind.