1) Aged 2) Ameliorated 3) Better 4) Bettered 5) Built 6) Cleared 7) Emended 8) Enhanced 9) Healthier 10) Honed 11) Landscaped 12) Redid 13) Reformed 14) Rehabilitated 15) Restored 1) Became better 2) Better 3) Built 4) Developed 5) Enhanced 6) Enhanced in value 7) Honed 8) Landscaped 9) Made better 10) New partner 11) Reinforced 12) Restored 13) Superior 
• (imp. & p. p.) of Improve
[adj] - (of land) made ready for development or agriculture by clearing of trees and brush 2. [adj] - made more desirable or valuable or profitable 3. [adj] - become or made better in quality
adjective become or made better in quality; `was proud of his improved grades`; `an improved viewfinder`