Supporting the principles of meliorism.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "meliorist" in a sentence
"No question but the novelist would have welcomed as a convincing proof of her 'meliorist' doctrine the progress made in her own homeland in the century since her birth."
"But while her virtue and courage are not open to question, her judgment is, and points to the limits of a meliorist approach to evil."
"Capitalism and collapse: contradictions of Jared Diamond's market meliorist strategy to save the humans [A book review from: Ecological Economics] by R. Smith"