1. Marked by or resulting from carelessness; negligent: an inadvertent error; an inadvertent omission.

2. Not deliberate or considered; unintentional: an inadvertent remark; inadvertent humor. See Synonyms at careless.

3. Not intending to be so; unwitting: "Physicians have already begun to take on the role of gatekeepers, inadvertent agents of selection ... deciding on the relative value of different human lives" (Robert Pollack).