What causes absent minded?

Absent minded means negligent because of thinking about other things than the matter at hand.

Abenst minded means that they are extremely forgetful, or wasn't thinking at the time or something similair. It is just an expression that a lot of old people use.

it is neglected

Someone who is always forgetting to do things.

The absent-minded professor would become preoccupied and forget where he parked his car.