low-key

from WordNet (r) 3.0 (2006)

low-key
    adj 1: restrained in style or quality; "a little masterpiece of
           low-keyed eloquence" [syn: {low-key}, {low-keyed},
           {subdued}]

from The Collaborative International Dictionary of English v.0.48

low-key \low-key\ low-keyed \low-keyed\adj.
   restrained in style or quality; not flashy or intense;
   understated; as, a little masterpiece of low-keyed eloquence.

   Syn: subdued.
        [WordNet 1.5]