Synonyms for diplomatic

tactful, suave, politic, discreet, calculating, shrewd, smooth, opportunistic, manipulative, adroit, judicious, conciliatory, conniving, scheming, Machiavellian, sly, artful, wily, subtle, crafty, sharp, cunning, contriving, delicate, sensitive, deft, dexterous, adept, intriguing, strategic, astute, statesmanlike, ambassadorial, consular, savvy*, cagey*; see also polite 1.

Antonyms tactless, artless, bungling. See syn. study at suave.suave.