from The Century Dictionary.

  • To render worse; injure the quality of.
  • To grow worse.

from the GNU version of the Collaborative International Dictionary of English.

  • transitive verb rare To make worse; -- the opposite of improve.
  • intransitive verb To grow worse; to deteriorate.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb transitive, rare to make something worse
  • verb intransitive, rare to deteriorate


from Wiktionary, Creative Commons Attribution/Share-Alike License

dis- +‎ improve


  • We don't do education well and the way we are doing it continues to disimprove.

    Things that strike me

  • At least you can actually download, disimprove and compile

    The Guardian World News

  • In the subgroup of patients amongst which this set of genes appears as regulated, it was shown that, although these patients initially responded to treatment, they were the ones who with greater frequency subsequently suffered relapse, disimprove and present the worst prognosis and survival rates.

    EurekAlert! - Breaking News

  • An unavoidable question in Intensive Medical Care is how many improve or recover the quality of life they had prior to admission to an Intensive Medical Care Unit (ICU) and how many disimprove and to what degree.

    Health News from Medical News Today


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