Antonyms for the phrase "keep posted" include neglect, ignore, forget, overlook, disregard, abandon, and forsake. These words convey the idea of not paying attention or being unaware of important updates or information. Neglect implies a failure to give proper attention or care, whereas ignore refers to actively choosing to disregard something. To forget or overlook information means to unintentionally miss it, while abandonment and forsaking convey the idea of deliberately leaving someone or something behind. In contrast, to keep posted means to stay informed and up-to-date on important news or developments, and its antonyms suggest the opposite - disengagement and disinterest.