Definitions

1. adjective

not excused or justified; unexplained or unapologetic

“The student was given detention for her unexcused absence from class.”

2. noun

a person who is not excused or justified for something

“The professor called out the unexcused student for not doing the assigned reading.”

3. verb

to be or become unexcused or unexplained

“The teacher warned the students that their tardiness would go unexcused after the second offense.”