mellifluous |məˈlifloōəs|adjective(of a voice or words) sweet or musical; pleasant to hear: the voice was mellifluous and smooth.DERIVATIVESmellifluously adverbmellifluousness nounORIGIN late 15th cent.: from late Latin mellifluus(from mel ‘honey’ + fluere ‘to flow’ ) + -ous .
What an awesome word—like honey dripping from a spoon. I can't say I've ever used it in conversation. Situations when you get to comment on another person's voice is rare, and even then we usually just say something like, oh yeah, she has a great voice. I wonder if David Attenborough's voice can be called mellifluous. I could listen to it for hours.