Millennials love to talk—and gripe—about ambition. What was once a virtue has become a generational bugbear. Millennial women, raised on Girl Power and rom-coms in which the heroine gets the job and ...

Ambition used to be a virtue. Somewhere along the way, it became a vice. Once a cornerstone of the American ethos—synonymous with self-reliance, upward mobility, and personal agency—ambition is now ...