substantial improvement
Synonyms for substantial
significant (meaningful, appreciable, dramatic
>>)
considerable
sizeable
large (major, big, real
>>)
important
great
strong
hefty
material
much
respectable
thorough
See all synonyms for substantialSynonyms for improvement
enhancement (advancement, betterment, advance
>>)
refinement
rehabilitation
upgrade
melioration
raising (enhancing, boosting, rising
>>)
See all synonyms for improvement