surreptitious

"The student scribbled notes in the margin of her textbook to help her remember the key concepts. "

"During class today the professor delivered an interesting lecture."

"My daughter's teacher is very kind and helpful. "

"The forest floor provided a thick, leafy covert for the rabbits, protecting them from predators. "

"My sister is very helpful, especially when it comes to organizing things. "

"I saw a movement in that grass on the hill."

"He is a student of life."

"The student made a furtive glance at the answer key during the test. "

"I tried to rollerblade, but I couldn’t."

"The student made a stealthy exit from the library, hoping no one would notice. "

"hidden treasure; hidden talents"

"The storm during all night. "