Underachievement (noun)

1. The state or condition of performing or achieving less than expected or desired.
2. The failure to reach one's potential.

Origin:

Mid 20th century: blend of under- and achievement.

Examples:

1. The school's high rate of underachievement was a concern.
2. His underachievement in school was due to a lack of interest.
3. The team's underachievement was a disappointment to the fans.
4. The company's underachievement was blamed on poor management.
5. The student's underachievement was a surprise to her teachers.