When someone has a memory lapse or forgets something, we often use the phrase "not recollected." Other synonyms that could be used to describe this situation include "not remembered," "forgotten," "slipped my mind," "totally blanked," "vanished from memory," "completely erased from recall," "unremembered," "unable to recall," and "escaped my mind." These terms describe instances when one cannot bring to mind a particular fact or piece of information. Whether it's a name, a place, or an event, the human mind has the potential to forget things from time to time and these synonyms can be used to express it in different contexts.