whatever [adverb] [not gradable] - used after a negative phrase to add emphasis to the idea that is being expressedHe has no respect for authority whatsoever.I can honestly say that I have no interest whatsoever in the royal family.There is no evidence whatever to show that this is in fact the case."Had you any idea what was happening at the time?" "None whatsoever".
WHATSOEVER
Meaning of WHATSOEVER in English
Cambridge English vocab. Кембриджский английский словарь. 2012