undiplomatic

US /ˌʌn.dɪp.ləˈmæt̬.ɪk/
UK /ˌʌn.dɪp.ləˈmæt̬.ɪk/
1.

poco diplomático

not typical of or suitable for diplomats (= officials whose job is to represent their country in another country, and who usually work in an embassy):

:
This was an unprecedented use of undiplomatic language by the veteran diplomat.