- unintentionally; accidentally
- Guess who I stumbled across?
- It's nice of you to say that it was inadvertent.
- He explained that he inadvertently hit the limiter button twice.
- He happened to take a glance at a disused bell that hung in the room.
- He then realized he had unintentionally gone to the dog shelter.
- He had unwittingly downgraded public opinion.