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overqualification

n. The quality of being overqualified.

Wikipedia
Overqualification

Overqualification is the state of being skilled or educated beyond what is necessary for a job. There can often be high costs for companies associated with training employees. This could be a problem for professionals applying for a job where they significantly exceed the job requirements because potential employers may feel they are using the position as a stepping stone.

In some societies, overqualification has become increasingly common as the proportion of college graduates in a population grows faster than the proportion of jobs in an economy which actually require college-level skills.