"worsening condition" is correct and can be used in written English.
Here is an example sentence: "The worsening condition of his knee will require surgery soon."
It showed her diligence and persistent wit as she continued working despite her worsening condition.
Sherrill called the hotline and emailed her doctor about her worsening condition and her brother's diagnosis.
Topics included diet, fluids or weight, signs or symptoms of worsening condition, medications, and exercise.
But Mr. Schrempp and other Daimler executives are themselves shellshocked by the worsening condition of their once-valued American acquisition.
What is more, there can be no restoration of the status quo because this is a permanent and worsening condition.
After Oregón was transferred to the step-down unit, we updated his mother on his worsening condition every day.
Though encouraged by the state of preservation of most of the clothes, she is also distressed by their worsening condition.
Rather than go around for another try, Mr. Misencik said, the crew tried to "salvage a landing in a worsening condition".
Cafferkey's worsening condition comes despite being diagnosed early and receiving treatment from some of the world's foremost experts in infectious diseases.
While increasing the urgency of the operation, his worsening condition also raised his score that determines priority for receiving organs when a donor becomes available.
"Given her worsening condition and unsupportable oxygenation," reads a Hopkins report on the incident, "her family elected to withdraw support and Ms. Roche died on June 2 , 2001.
