suave

Adjective

• smoothly agreeable and courteous with a degree of sophistication
  • he was too politic to quarrel with so important a personage
    
  • the manager pacified the customer with a smooth apology for the error
    

• having a sophisticated charm
  • a debonair gentleman
    

Related words

• Synonyms: 
  politic , smooth , bland , debonair , debonaire , debonnaire