Inadvertent means not intentional or planned.
Inadvertent is an adjective.
Synonyms: involuntary, unthinking, accidental, fortuitous, unintentional, unpremeditated.
Antonyms: intentional, premeditated, aware, conscious, considered, deliberate.
The cook inadvertently put a spoon of salt instead of sugar in the coffee.
Durga's inadvertent reference to the crime scene led the judge to believe she was guilty.
I don't believe your actions were inadvertent. How could you accidentally forget my payroll checks and deposit the money into your weekend fund?