Middle English from Old French from Medieval Latin inadvertentia Latin in-notin–1 Medieval Latin advertentiaadvertenceadvertence
The court has also the power to relieve from the consequences of certain innocent contraventions of the law caused by inadvertence or miscalculation.
The claim was refused, but on the 9th, through the inadvertence of the doorkeepers, Prynne, Annesly and Hungerford succeeded in taking their seats.
Iseult of the white hand overhears this, and when the ship returns, bringing Iseult to her lover's aid, either through jealousy or by pure inadvertence (both versions are given), she tells Tristan that the sail is black, whereon, despairing of seeing his love again, the hero turns his face to the wall and dies.
A mistake, even a serious one will not suffice, nor will mere inadvertence.