UNTAMABLE

a. 1. That cannot be tamed or domesticated; that cannot be reclaimed from a wild state.
2. Not to be subdued or reduced to control.

untamable

un tam a ble |ˌənˈtāməbəl ənˈteɪməbəl |(also untameable ) ▶adjective (of an animal ) not capable of being domesticated. • not capable of being controlled: her untamable mop of thick black hair.