significant improvement
Synonyms for significant
substantial (appreciable, dramatic, serious
>>)
considerable
important (meaningful, momentous, vital
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major
sizeable
strong
powerful
much
great
heavy
See all synonyms for significantSynonyms for improvement
enhancement (advancement, betterment, advance
>>)
refinement
rehabilitation
upgrade
melioration
raising (enhancing, boosting, rising
>>)
See all synonyms for improvement