diplomatically
adverb /ˌdɪpləˈmætɪkli/
  /ˌdɪpləˈmætɪkli/
 - in a way that is connected with managing relations between countries (= diplomacy)- The country remained diplomatically isolated.
 
- in a way that shows skill in dealing with people in difficult situations synonym tactfully- ‘Why don't we take a break for coffee?’ she suggested diplomatically.