1. Not capable of being improved on
   - unexcelled, unexceeded

See also: best

• high street
• high style
• high table
• high tea
• high technology
• high temperature
• high tide
• high time
• high treason
• high wind
• high wire
• high-altitude
• high-and-mighty
• high-angle fire
• high-angle gun
• high-backed
• high-bush blueberry
• high-ceilinged
• high-class
• high-crowned
• high-definition television
• high-density lipoprotein
• high-energy
• high-fidelity
• high-five