Unintentionally; because of an oversight.

Inadvertence; heedlessness.

Not intentional; not on purpose; not conscious. / (obsolete) Inattentive.

The state or quality of being inadvertent; inadvertency; heedlessness; carelessness; negligence. / An effect or result of inattention; an oversight or mistake from negligence.

plural of inadvertency

plural of inadvertence