mournful

"Her grandmother had passed away after a long illness."

"His lack of respect disappointed her."

"The whole town mourns the loss of the beloved doctor. "

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

"The teacher filled the bottle with water. "

"The atmosphere was thick with the smell of popcorn, as the kids gathered for the movie night. "

"The sadness she felt after failing the test was understandable. "

"The entire class was mourning the loss of their beloved teacher. "

"My sister's joyful expression showed how happy she was about the good news. "

"The teacher's passionate speech inspired the students to work harder on their projects. "

"He is a student of life."

"the result of a course of action;  the result of a mathematical operation"