kill (someone) softly

Translations
незаметно задеть (кого-то)
Her sarcastic remarks were designed to kill him softly.
Ее саркастические замечания были задуманы, чтобы незаметно задеть его.
Definitions
To harm, criticize, or undermine someone in a subtle, gentle, or indirect way, rather than through overt aggression or violence.
Words
kill

verb
убить
softly

adverb
мягко