D defs.my
Entry 1 sense Webster, 1913

low-key

· IPA /ˈloʊˈki/
01 adj. restrained in style or quality; not flashy or intense; understated; as, a little masterpiece of low-keyed eloquence.
  1. 1.
    restrained in style or quality; not flashy or intense; understated; as, a little masterpiece of low-keyed eloquence.
Syn. subdued.