Deterioration (noun) خراب ہونا، بگاڑنا

the process of becoming progressively worse.
Example: “a deterioration in the condition of the patient”
Stimulate (verb) جوش دلانا، ابھارنا، اکسانا ، جذبہ پیدا کرنا

raise levels of physiological or nervous activity in (the body or any biological system).
Example: “the women are given fertility drugs to stimulate their ovaries”