The manager kept overpromising features to clients, which later caused delays and disappointment.

Don't overpromise results you can't control just to win the client's approval.

Our new vendor overpromises and then underdelivers, harming our project's timeline.

The startup overpromised delivery dates and later had to issue refunds.

Investors quickly learned to ignore the overpromisers after the start-up failed to deliver on its bold claims.

Even though he's an overpromiser, the team still gives him the benefit of the doubt.