Caught napping, a phrase used to describe being caught off guard or unprepared, has several synonyms. One such synonym is "caught unaware," which expresses the same sentiment of not being prepared or caught off guard. Another synonym is "caught off one's guard," which also denotes that someone was caught unprepared for a situation. A third synonym is "taken by surprise," which signifies that someone has been caught in an unexpected situation. Other synonyms for "caught napping" include "caught out," "unawares," and "blindsided." These expressions all convey the same meaning of being caught off guard or unprepared for something that has happened unexpectedly.