excruciatingly

"The math test was excruciating; I struggled with every problem. "

"The long walk home after school was painful because of my sore feet. "

"The loud gunshot startled the birds in the park. "

"The student's anguish over failing the exam was evident in her slumped posture. "

"The extreme of the workday was the three-hour meeting. "

"My sister earned a degree in psychology from the university. "

"The leaky faucet in the kitchen is a problem that needs fixing. "

"Newton and Einstein are two of the greats of the history of science."

"My sister learned to write in a very careful manner. "

"The teacher's voice was intense as she explained the difficult math problem. "

"The complicated instructions on the new software difficult me from completing the project on time. "

"The lightning caused thunder."