Hairy scary can refer to something that is both frightening and hairy, or to something that is simply unkempt or wild in appearance. Synonyms for hairy scary could include words like frightening, spooky, creepy, or alarming. Other options might include words like wild, untamed, disheveled, or rough-looking. Depending on the context in which the term is being used, other synonyms might include words like menacing, hair-raising, or bone-chilling. Ultimately, the right synonym for hairy scary will depend on the specific nuance of the situation, and the particular effect that the speaker or writer is trying to achieve.