com ‧ punc ‧ tion /kəmˈpʌŋkʃ ə n/ BrE AmE noun [uncountable usually in negatives] formal
[ Date: 1300-1400 ; Language: Old French ; Origin: componction , from Late Latin , from Latin compungere 'to sting' , from com- ( ⇨ COM- ) + pungere ( , ↑ pungent ) ]
a feeling that you should not do something because it is bad or wrong
have/feel no compunction about (doing) something
He had no compunction about interfering in her private affairs.
They used their tanks against the leftists without compunction.