wild man

/W AY1 L D M AE1 N/
noun
  1. 1

    A primitive man who dwells outside of civilized society; a savage person without culture.

  2. 2

    A violent, dissolute, rash, or rowdy man.

  3. 3

    A man who advocates unorthodox or outrageous opinions or who behaves in an eccentric manner.

Source: https://en.wiktionary.org/wiki/wild%20man