adj. 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). in′ad·vertent·ly adv.  | 
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