unexcused (adjective)

1. The student missed school because of an unexcused absence and decided to stay home and binge-watch anime all day.

2. The artist failed to submit his assignment on time and received an unexcused late notice from his professor.

3. The unexcused absence of the protagonist's best friend from their haunted house exploration left the character feeling terrified and vulnerable.

4. The moviegoer was disappointed to find out that the theater was unable to refund his ticket after an unexcused cancelation of the screening.