He displayed perseverative behavior, repeating the same action over and over again.

He continued to work perseveratively despite facing numerous obstacles.

Her perseverativeness helped her overcome all obstacles and achieve her goals.

She showed great persevering in her studies.

She is persevering in her studies.

She is a persevering student who never gives up on her studies.

The perseverings never give up on their dreams.

She persevered through difficult times and achieved her goals.

She perseveres through difficult times.

He persevered through difficult times.