debilitating

"The coffee concentrate was strong, so a little went a long way. "

"The failing grades were a crisis point in Sarah's academic career. "

"It requires great strength to lift heavy objects."

"The long illness weakened the child, making it harder for her to focus on schoolwork. "

"Many people took out subprime loans to buy houses, even though they had a difficult time paying bills. "

"The effect of the hurricane was a devastated landscape."

"Is anyone here afraid of suffering hardship?"

"Maria couldn't go to the park because she had to finish her schoolwork. "

"My terrible headache kept me from concentrating on my math homework. "

"The illness gradually weakened and feebled him, making it hard to complete his daily tasks. "

"The impossible of finishing the project by Friday became a reality when everyone worked late. "

"The lightning caused thunder."