Difficult, complex, intricate, or intimidating.
Having a lot of fur.
Having a lot of hair on the body.
Having hair growing from it.
Causing anxiety or fright; terrifying, scary.
Intricate, involved, entangled, complicated, complex.
A genealogical coefficient of a given genealogical tree; defined as the difference between the number of theoretical ancestors of a person and the number of his/her real ones in a given generation (the degree of pedigree collapse).