enfeebling

"The oven is hotting up the pizza quickly. "

"The oak tree's large leaves provided shade for the children playing in the park. "

"the heat of summer"

"What make of car do you drive?"

"They brought their books with them."

"a vegetable garden  a flower garden"

"The garden had a couple of trees, and a cluster of colourful plants around the border."

"Our solar system's sun provides the light and warmth necessary for life on Earth. "

"It looks weaker and weaker, the more I think about it."

"The wilted flowers were a sad droop in the vase. "

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

"The lightning caused thunder."