excruciating

"The child's enthusiasm for the new school project was exceedingly high. "

"The student agonizing over the difficult math problem felt a sharp pain in their head. "

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

"The gunshot wound was excruciatingly painful."

"During the centuries, the people of Ireland struggled constantly to assert their right to govern themselves."

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

"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."

"The student is taking notes in class to remember the important information. "

"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."