[1] : WordNet (r) 2.0

understated
     adj : exhibiting restrained good taste; "the room is pleasant and
           understated" syn: unostentatious, unpretentious
see also:
unostentatious unpretentious 

[2] : Moby Thesaurus II by Grady Ward, 1.0

25 moby thesaurus words for "understated":
   attic, aesthetic, artistic, basic, chaste, choice, classic,
   excellent, in good taste, low-key, of choice, of quality, pleasing,
   pure, quiet, restrained, simple, subdued, subtle, tasteful,
   unadorned, unaffected, unembellished, unobtrusive, well-chosen

Understated >> U Words
Understated, definition of term: Understated
understated_pag1.html