Simple:
* His leg muscles atrophied after being in a cast for months.
* The lack of use caused the muscle to atrophy.
Figurative:
* Her creative spirit atrophied from years of working a dead-end job.
* The town's economy has atrophied due to lack of investment.
Formal:
* The study found a correlation between sedentary lifestyles and muscular atrophy.
* The scientist observed the atrophy of the plant cells under the microscope.
Specific:
* The patient's left arm displayed significant atrophy after the stroke.
* The doctor noted the atrophy of the patient's optic nerve, indicating potential vision loss.
Remember that "atrophy" refers to a decrease in size or wasting away, usually of muscle or other tissue. It can also be used figuratively to describe a decline or weakening of something, like a skill or an economy.