a ‧ nath ‧ e ‧ ma /əˈnæθəmə, əˈnæθɪmə/ BrE AmE noun [singular, uncountable] formal
[ Date: 1500-1600 ; Language: Late Latin ; Origin: Greek , 'thing given over to evil, curse' , from anatithenai 'to set up, dedicate' ]
something that is completely the opposite of what you believe in
anathema to
His political views were anathema to me.