Synonyms and related words :
bland, buttery, deferential, fair-spoken, fine-spoken, fulsome, glib, honey-mouthed, honey-tongued, ingratiating, insinuating, insinuative, oily, oily-tongued, saccharine, silken, silky, smooth, smooth-spoken, smooth-tongued, smug, soapy, soft-spoken, suave, suave-spoken, unctuous