tribal(a = adj.pert) - relating to or characteristic of a tribe; "tribal customs"
Derived forms noun tribe₄, noun tribe₂, noun tribe₁

   Of or pertaining to a tribe or tribes; as, a tribal scepter. Bp. Warburton. [1913 Webster]

tribal, adj. of, relating to, or characteristic of a tribe or tribes.

Derivative:
tribally adv.

tribal chief, tribal sheik, tribal sheikh, tribal society