1. Restrained in style or quality
   "a little masterpiece of low-keyed eloquence"
   - low-key, subdued

See also: restrained

• high-bush blueberry
• high-ceilinged
• high-class
• high-crowned
• high-definition television
• high-density lipoprotein
• high-energy
• high-fidelity
• high-five
• high-flown
• high-grade
• high-handed
• high-handedly
• high-handedness
• high-hat cymbal
• high-interest
• high-keyed
• high-level
• high-level formatting
• high-level language
• high-level radioactive waste
• high-low
• high-low-jack
• high-minded
• high-mindedly