whoever

 
Pronunciation: /huːˈɛvə/

relative pronoun

  • the person or people who; any person who: whoever wins should be guaranteed an Olympic place
  • regardless of who: come out, whoever you are

interrogative pronoun

  • used for emphasis instead of ‘who’ in questions, typically expressing surprise or confusion: whoever would want to make up something like that?

In emphatic use whoever is also written as two words: whoever/who ever does he think he is? See however (usage).