Overqualified

This is a term used in job searches primarily and means "having more education, training, or experience than is required for a job or position".

It does have negative qualities about it though and I might suggest these are undeserved, for they are one-sided at best.

For the employer, having an employee who is over-qualified might lead to that employee's boredom or distaste for a given job that they might perceive was beneath them. Realistically the employer gets a staff member who should be well capable of performing the role in question given that they probably offer significant experience and qualifications.

Importantly, it's the employee's choice to accept a role for which they are perceived to be over-qualified. But, it is their risk, and the downside is really all theirs. When would an individual choose to take on such a role..? When they want to mentor, (and can't get a job at a Biz school!) or when they want to blow away a known set of goals and love an industry. Or perhaps, it could be that they really admire the company in question, and just want to be along for the ride.