stupor

"My younger sister is a teenager now, and she's starting to get more independent. "

"He was stupified by the news."

"My teacher explained the new math concept, and I understood it perfectly. "

"The child's heightened sensibility allowed her to notice the subtle changes in her mother's mood. "

"What is your thinking on this subject?"

"The difficulty of the math problem made it hard for many students to solve it. "

"My brother's lack of consciousness during the lecture made it hard for him to understand the material. "

"He is a student of life."

"The teacher praised the student's quick respond to the question. "

"The straight path to the school led past the park. "

"The construction crew's working on the new school building is going smoothly. "

"to reduce weight, speed, heat, expenses, price, personnel etc."