Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb improve

2 senses of improve

Sense 1
better, improve, amend, ameliorate, meliorate -- (to make better; "The editor improved the manuscript with his changes")
       => change, alter, modify -- (cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue")

Sense 2
better, improve, ameliorate, meliorate -- (get better; "The weather improved toward evening")
       => change state, turn -- (undergo a transformation or a change of position or action; "We turned from Socialism to Capitalism"; "The people turned against the President when he stole the election")

Antonyms of adj improving

1 sense of improving

Sense 1
improving, up -- (getting higher or more vigorous; "its an up market"; "an improving economy")

INDIRECT (VIA rising) -> falling -- (becoming lower or less in degree or value; "a falling market"; "falling incomes")

Similarity of adj improving

1 sense of improving

Sense 1
improving, up -- (getting higher or more vigorous; "its an up market"; "an improving economy")
       => rising (vs. falling) -- (advancing or becoming higher or greater in degree or value or status; "a rising trend"; "a rising market")