Amnesia is the condition where an individual is unable to recall past events or retain new information. The word olisthetic is one of the synonyms of amnestic, used to describe the inability to remember particular types of information, such as a group or category of items. Another synonym is amnesic syndrome, referring to a more severe form of amnesia caused by brain damage or injury. Retrograde amnesia, on the other hand, refers to the inability to recall events that occurred before the onset of amnesia, while anterograde amnesia describes the inability to form new memories after a particular event. Other synonyms include memory loss, forgetfulness, and blackout.