This is the 11220th most frequent Polish word.
grypopodobne
"Flu-like."
The word "grypopodobne" describes symptoms that resemble influenza (grypa), used here as an adjective modifying "objawy" (symptoms).
Objawy grypopodobne mogą wystąpić po szczepieniu.
Influenza-like symptoms may occur after vaccination.
"Grypopodobne" functions as an adjective here and applies to "bóle mięśni i stawów" (muscle and joint pains), indicating the qualities or resemblances noticeable when compared to symptoms of the flu.
Pacjent skarżył się na grypopodobne bóle mięśni i stawów.
The patient complained about flu-like muscle and joint pains.
Here, "grypopodobnych" describes "reakcji" (reactions), specifying the type or nature of reactions.