Adjective for hair

Technically, an adjective is a Word that describes something. So an "adjective for hair" would be a Word that describes hair-dark, brown, shiny, stringy, short, stylish... There are countless possibilities.

Perhaps you meant, "What is an adjective that means 'hairy'?" The best one I can think of is "hirsute", though it's rather fancy and was used more commonly back when people actually cared about language.